Olive oil is fruit oil obtained from the olive (Olea europaea; family Oleaceae), a traditional tree crop of the Mediterranean Basin. Although more expensive than other oils, olive oil has many health benefits. It has the highest percentage (about 77%) of monounsaturated fat among commonly used oils. Studies have found that consumption of olive oil can lower the risk of heart disease by reducing blood cholesterol levels and blood clot formation. It also contains many antioxidant phytochemicals that have many health benefits.
This oil is extracted by pressing or crushing olives and comes in different varieties depending on the amount of processing involved. Varieties include:
Extra virgin: Considered the best, this oil comes from the first pressing of the olives.
Virgin: Comes from the second pressing.
Pure: Undergoes some processing, such as filtering and refining.
Extra light: Undergoes considerable processing and only retains a very mild olive flavour.
Olive oil is great oil for cooking. When cooking with olive oil, save your extra-virgin expensive oils for salads, dressings and vinaigrettes. You can also drizzle it over slices of crusty bread or onto open-face sandwiches. Use it on a baked potato or add it to mashed potatoes instead of butter. Extra virgin olive oil tastes great on cooked vegetables or brushed onto fish or meat before serving.
The simplest form of carbohydrate is sugar. Both processed (refined) and unprocessed foods are carbohydrate. The good carbohydrates are unprocessed whole foods containing natural sugars like lactose in milk and fructose in fruits. The best source of good carbohydrate is from plant source as it provides vitamins, fiber, minerals and pytochemical along with grams of carbohydrate. Carbohydrate is required for various metabolic function of the body. It is the primary source of energy for vital organs, brain, central nervous system and kidney. Carbohydrate is broken down into glucose in the digestive system. Insulin, hormone secreted by pancreas helps the transport of glucose from blood into the tissues as energy.
The bad Carbohydrates are sugar in refined form, such as sucrose (table sugar), added sugar. White refined grains are not good for the body because it provides calories but no nutrients. Refined foods are low in fibers and cause health risk, and also increase the risk of heart disease. Whole grains, vegetables full of fibers are good carbohydrates and also promotes required nutrients and helps lower risk of chronic disease.
The growing varieties of food in supermarkets have left us with food choices that are either harmful or beneficial. We need to act responsible by looking at the nutritional food level when purchasing.
USDA’ survey shows that in the U.S an average adult takes about 20 teaspoons of added sugar that is 320 calories everyday. People do not realize these 320 calories by consuming added sugar can add extra pounds quickly. Too much sugar in diet can quickly cause weight gain. Consuming high carbohydrate diet may predispose to weight gain because one gram of carbohydrate gives four calories. Food high in carbohydrate are also are high in calories. Obesity is the end result of consuming too many calories each day from all sources of carbohydrate, protein and fat. USDA recommends only about 9 teaspoon of added sugar a day. Commercially added sugars in beverages or baked products are to be avoided.
Food containing fibers are good for health and wellbeing. Dietary fibers are indigestible form of carbohydrate not absorbed in the intestinal tract. The foods that are refined or whiter grains have lower fibers. White grains food such as muffins, bagel, hamburger bun, and white rice is poor source of fiber. Fibers based food slows peak in blood glucose level thus reducing the risk for Diabetes. Fibers rich foods such as oats, beans and fruits help lower cholesterol.It also makes full and reach satiety. In order to add fibers to our diet, foods like whole grains, beans, plenty of fruits and vegetables must be included in our daily food choices. Fibers in diet may also have positive role in weight management.
Carbohydrate containing food is usually rated by its glycaemic index. Food that takes longer time to be absorbed is called as low glycaemic index. Whole grains, fruits, veggies, beans have lower glycaemic index as they get absorbed slowly in the body thus avoiding spikes in blood sugar level.
Carbohydrate food that spikes blood glucose level quickly is called high glycaemic index food like potatoes, white bread and white rice. Sugar added foods; starchy foods, raises blood glucose level quickly because they are rapidly absorbed in the blood stream.
Studies have concluded that everyone especially people with diabetes should eat food with low glycaemic food like soy products, beans, fruits, milk and grain bread.Plant based food high in fruits and vegetables, whole grains, legumes and low fat diary products moderate in calories can result in weight management. Boosting vegetarian diet is a smart & healthy move in life.
Best way to achieve healthy weight is to watch calorie intake. The secret to remain healthy is to avoid simple Carbohydrate like sugar sweetened food, soda drinks and sweets; as these are high in calories with no nutrients. This type of food makes us sleepy, tried and increases craving for more sweetened foods.
Carbohydrates’ have an important role in balanced diet so we need to act smart and be careful when choosing carbohydrate containing food.
An estimated 33 million people are HIV positive worldwide. HIV-1, a retro virus is responsible for most cases world wide. HIV-2, a related virus produces a similar illness with a longer latent period. More than 3 million have acquired immune deficiency syndrome (AIDS). HIV infection is more prevalent among women and children in sub Saharan Africa. In previously healthy homosexual men cases of rare neoplasm, Kaposi’s sarcoma, and pneumocystis carinii pneumonia were reported in the USA during 1981. This epidemic was eventually termed as the acquired immunodeficiency syndrome (AIDS). The association between HIV virus infection and the development of AIDS was established in 1984. The global AIDS pandemic has stimulated unprecedented research on the pathogenesis, management and control of the disease that has expanded.
The world health organization estimates that number of people living with HIV in year 2007 was 33 million. Around 90% are in developing countries unable to afford the expensive medical care required to control the disease progression. WHO reported 2.7 million new HIV infections and 2.0 million deaths due to AIDS in 2007. Sub-Saharan Africa is the most-affected region in the world as measured by HIV/AIDS prevalence rates.An estimated 22 million adults and children are living with HIV in Sub Saharan African,4.2 million in South and south east Asia, eastern Europe and central Asia 1.5 million, east Asia 740000, Oceania 74000, middle east and north Africa 380000, western and central Europe 730000, Latin America 1.7 million, north America 1.2 million, Caribbean 230000 respectively.The prevalence of disease is more than 96% in low and middle income countries. WHO reports, Over 7400 new HIV infectionsa day in 2007. The disease has affected about 1000 children under 15 years of age and about 6300 adults aged 15 years and older.
Women comprise 50% of adults estimated to be living with HIV/AIDS worldwide. Young people under the age of 25 years are estimated to account for more than half of all new HIV infections worldwide. The early epidemics of HIV was facilitated by travel and migration and later by female sex workers and their clients, important risk factor for transmission being the intravenous drug use and use of HIV infected blood and blood products. HIV probably originated from rural areas where it had been endemic at low levels but then spread amongst sexually active population in cities, initially in the early 1980’s amongst homosexual men in the developed countries of Europe, North America, and Australia. This series of epidemic was followed by a wave with predominant heterosexual spread in sub Saharan Africa and South America and lately to south East Asia, where the epidemics have been late in developing but are accelerating at an alarming rate.
There is no single AIDS epidemic worldwide. Instead, many regions and countries are experiencing diverse epidemics. The characteristic of HIV disease in each region are determined by many different microbiological, cultural, social and behavioral aspects. As for example, HIV infection in Uganda, where heterosexual transmission is predominant and infection rate is higher in rural areas. HIV infection in many parts of U.S remains rare, being seen amongst homosexual men and intravenous drug users at a highest rate in major cities. The epidemics in Europe, North America, and Australia have been stabilized, although cases contracted heterosexually and through vertical transmission continue to rise. So, far the sub Saharan African has been the hardest hit by HIV epidemic and rapid spread continues in south East Asia. HIV Infection has a profound impact in the economic and demography of a country. The life expectancy of many children’s are affected as a consequences of increasing heterosexual transmission of HIV. The prevalence of HIV is common between age groups 15 to 50 years who are the economically productive age groups in most countries.
(HIV) - Human Immunodeficiency Virus belongs to the subfamily of retroviruses which have an RNA genome. HIV has a core consisting of the RNA genome and core protein surrounded by an envelope with high lipid content, rendering it sensitive to organic solvents. HIV gains entry to host cell by binding to the CD4 receptor using the viral surface membrane glycoprotein gp 120. Host target cells of preference, therefore,carry the CD4 molecule which is recognized by the virus, but in addition other cell surface molecules act as receptors and co-receptors for the virus. The RNA viral genome is transcribed to DNA copy by reverse transcriptase enzyme.Then the DNA copy integrates into host cell genome in cell nucleus via integrase enzyme. Following cell activation viral DNA is translated to RNA copies in cytoplasm. Viral peptide chains are translated from cytoplasmic viral RNA. HIV proteinase cleaves functional viral proteins from polypeptides. Virion assembly occurs.Viral release from cell surface by cell lysis. There is a huge diversity amongst HIVs, which occurs in 2 main types: HIV 1 and HIV 2. Disease caused by HIV 2 is similar to disease caused by HIV 1 but is generally milder, slower to progress and poorly transmitted vertically. HIV 1 is responsible for most of the disease seen world-wide.HIV 1 is divided into several subtypes,and there are atleast five subtypes of HIV 2. The acquired immune deficiency syndrome (AIDS), caused by the HIV-1 RNA retro virus, is the most common acquired immune deficiency in the United States. AIDS is currently the most common cause of death in black men and women from 25 to 44 years of age. The acute phase of HIV infection develops within 2- 4 weeks of contracting the virus. It is characterized by fatigue, sore throat and lymphadenopathy, the CD4 counts are normal to low, with an increase in the P24 antigen which is an indicator of disease activity. In approximately 4 -12 weeks (window period) antibodies against gp 120 and other antibodies are not detected. ELISA test which are positive are confirmed by western blot analysis, which detects more than one HIV antibody (eg; p24 and gp41). After the acute phase, patient enters an asymptomatic latent phase, in which the actively proliferating virus is present within the dendritic cells located in the lymph nodes.After an average span of 4- 10 years, patients enter the late phase of the disease, where the CD4 count drops below 400 cells/microlitre, the p24 antigen resurfaces, and opportunistic infection develops. AIDS is a multisystem disorder with the lungs representing the most frequently involved site. An opportunistic infection or a CD4 count of less than 200 cells/microlitre is sufficient to diagnose AIDS. The average life span from the beginning of infection to death of the patient is 10 years. HIV infection is confirmed by demonstrating the presence of antibodies to HIV in serum.The enzyme -linked immunosorbent assay (ELISA) test used for detecting antibodies to HIV is simple and cheap and has the advantage of a very low false negative rate so that the infected cases are unlikely to be missed. All the positive results are normally confirmed by the more precise western blot test, which also detects the presence of anti- HIV antibodies.Serial testing may be required following a high risk of exposure to HIV to exclude infection. Following HIV infection the production of detectable antibodies to various components of the virus,including antibody to the gag protein, integrase and reverse transcriptase may not occur for 6-12 weeks and sometimes much longer. Antibody detection test are unhelpful and misleading in neonates who may be infected because of the presence of transplacentally acquired maternal antibody. The polymerase chain reaction (PCR) can be used in this situation to detect the presence of viral genome in the peripheral blood lymphocytes.However, ELISA remains the routine screening test and is used by centers offering same day or rapid testing services.The advantage of knowing that an individual is HIV-seropositive include appropriate medical care and prophylactic measures which will benefit health, prolong life, and avoid infection to others. When an HIV test is negative the patient should be advised to practice safe sex and to abstain from avoidable risk factors, such as sharing needles for intravenous drug use. There are three possible modes of transmission of HIV; sexual, perinatal, parenteral. Infection with HIV essentially requires exchange of semen, vaginal or other body secretions, milk or blood or blood products infected by virus. The risk of HIV transmission is greatest with vaginal and anal intercourse. The risk of transmission during intercourse is further increased by presence of sexually transmitted disease, such as any genital ulceration. Perinatal transmission is increasing globally as a direct result of the increase in number of women with HIV infection who are of child bearing age. HIV during parturition on contact with HIV-containing fluids in the vagina accounts for around 80% of vertical transmission. Neonates of HIV infected women have a 13-52% chance of acquiring HIV from the mother. In utero the virus may infect the fetus by crossing the placenta. Intravenous drug users (IVDUs) are at risk of HIV infection as a result of sharing needles, which allows transmission of HIV infected blood from one individual to another. Transmission of HIV among health-care workers following occupational exposure is a rare event, the major risk factor is a needle stick injury with HIV contaminated blood from an infected patient. PREVENTION MEASURES FOR HIV TRANSMISSION: SEXUAL - public awareness campaigns for HIV, safe sex practice like avoidance of penetrative intercourse and use of condoms, targeting safe sex methods at sex industry workers, and control of sexually transmitted diseases. PARENTERAL- Routine screening of blood or blood products for HIV, needle exchange programmes of Intravenous drug users (IVDUs). PERINATAL - Routine HIV testing at antenatal clinics, avoidance of pregnancy if HIV- seropositive, Anti-retro viral therapy during pregnancy, delivery or postnatally.
Every woman who could become pregnant are recommended 400 micrograms (400 mcg) of synthetic folic acid every day. The causes of folate deficiency are, due to poor diet or less intake of vegetables as in alcoholics, or increased demand during pregnancy, haemolysis, dyserythropoiesis, malignancy, long term hemodialysis, malabsorption especially in coeliac disease, tropical sprue and certain drugs like phenytion and trimethoprim all causes folate deficiency. Folate is found in green vegetables, fruits, liver, and is synthesized by gut bacteria. Good sources of folate are, brussels sprouts, fortified breakfast cereals, spinach, asparagus, beetroot, orange, avocado,melon, potatoes, cauliflower, peas, wholemeal bread, dried beans. Liver is the richest source of folate but an alternative source is advised in early pregnancy because of its high vitamin A content. The most serious side-effects of repeated moderate or high doses of retinol are liver damage, hyperostosis and teratogenity.Therefore woman's who are pregnant in developed countries are advised not to take vitamin A supplements. Body stores folate sufficient for three months, folate is absorbed mainly in the jejunum. Maternal folate deficiency is also linked to neural tube defects in fetus. Folate is directly involved in DNA and RNA synthesis and it seems that a higher than normal level is required during embryonic development. All women planning a pregnancy are advised to include good source of folate in their diet. Folic acid ( pteroylglutamic acid) and related compounds are known as folates. The body obtains folate by breakdown of food polyglutamates to monoglutamates in the small intestine, much is destroyed by cooking. Folic acid as such is available only as a medicinal compound. The coenzyme form of this vitamin is tetrahydrofolic acid. Folic acid deficiency is most commonly seen in pregnancy and alcoholism. Folic deficiency states can result in megaloblastic anemia and neural tube defects (NTDs). Folic supplemetation is recommended before and during pregnancy. Neural tube defects (NTDs) are major birth defects of a baby’s brain or vertebrae. Neural tube defect is an Imperfect closure of the neural tube which takes place 3-4 weeks after conception, which results in birth defects like, spina bifida, anenecephaly, and encephalocele. These birth defects can cause lifelong disability or death. Studies have shown that folic acid reduces recurrence or occurrence of these deformities by about 70 %, but it must be taken prior to and following conception. About 3,000 pregnancies in the United States are affected by spina bifida or anencephaly each year. Many of these defects could be prevented if all women got enough of the B vitamin folic acid every day starting before they get pregnant. Anencephaly is one type of the fetal anomaly where the vault of the skull and brain tissue are absent, the cause is due to failure of the closure of cephalic part of neural tube (open neural tube defect). Babies with this defect die before birth (miscarriage) or shortly after birth. Any woman can have a baby with an NTD. If a woman can get pregnant, she is at risk for having an NTD-affected pregnancy. No one can predict which women will have a pregnancy affected by an NTD. All women are at risk. The neural tube is a narrow sheath that closes to form the brain and spinal cord of the embryo. As development progresses, the top of the tube becomes the brain and the remainder becomes the spinal cord. This process is usually complete by the 28th day of pregnancy. But if problems occur during this process, the result can be brain disorders called neural tube defects, including spina bifida. Spina bifida, is characterized by the incomplete development of the brain, spinal cord, and meninges (the protective covering around the brain and spinal cord). It is the most common neural tube defect in the United States affecting 1,500 to 2,000 of the more than 4 million babies born in the country each year. Most children born with spina bifida live full lives, but they often have lifelong disabilities and need many surgeries. The effects of spina bifida are different from each children all don’t have the same needs. Some children’s problems are much more severe than others. The neural tube is the tissue of an embryo (a developing baby to the eighth week after conception). Normally, a fetus’s central nervous system develops inside the neural tube. When this tube does not close properly, an encephalocele may result. Either skin or a thin membrane covers the defect An encephalocele is classified as a neural tube defect. An encephalocele is a rare disorder in which the skull do not close completely, creating a gap through which cerebral spinal fluid, brain tissue and the membrane that covers the brain (the meninges) can protrude into a sac-like formation. The physical and emotional tolls upon the families affected by birth defects are high. That’s why it’s so important to encourage women to take folic acid every day to help prevent these birth defects. Folic acid is a B vitamin that the body needs to make healthy new cells. Every woman who could possibly get pregnant are recommended to take 400 micrograms (400 mcg or 0.4 mg) of folic acid daily in a vitamin or in foods that have been enriched with folic acid. Along with taking a vitamin or eating a cereal that has 100% DV of folic acid, women should always eat a healthy diet that has lots of fresh fruits and vegetables and other healthy foods. However, how folic acid works to prevent birth defects is unknown. But studies show that folic acid is needed to make healthy new cells. Taking folic acid every day, starting before and during pregnancy, can reduce the risk for these serious birth defects by 50% to 70%. Most women in the developed and developing countries do not get enough folic acid to help prevent birth defects. The average woman gets less than the amount needed from her diet alone. That’s why all women who can get pregnant are encouraged to take a vitamin with folic acid or eat a serving of fully fortified breakfast cereal each day. Folic acid might help to prevent some other birth defects, such as cleft lip and palate and some heart defects. Everyone needs folic acid. But for women who can get pregnant, it is much more important. If a woman has adequate folic acid in her body before she is pregnant, this can help prevent major birth defects of her baby's brain and spine.Women need to take folic acid every day, starting before they are pregnant to help prevent NTDs.
It contains 4,700 chemical compositions, of which 43 are known carcinogens. Out of these carcinogen, tobacco-specific nitrosamines (such as 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) and N'-nitrosonornicotine (NNN)), polycyclic aromatic hydrocarbons (such as benzo[a]pyrene) and aromatic amines (such as 4-aminobiphenyl) are the ones that play an important role in causing of cancer. Nicotine and carcinogens are two factors, whose combination leads to 30% of cancer-related deaths in developed countries. Heavy smoking habit parallels the rise in cancer. 1.1billions smokers are estimated world wide. Smoking is now an equal opportunity killer among peoples living in both developing and developed countries. Smoking is responsible for fully 30% of all cancer related deaths. Nicotine is not carcinogenic, but it is addictive and toxic. It is the addiction of nicotine that makes people use tobacco products, which contains various kinds of carcinogens. Impacts of smoking on health are reflective of rate of lung cancer. Exposure route and impacts Exposure can result from: a) Active smoking- tobacco smoke in environment is derived from either main stream smoke (exhale smoke).
b) Passive smoking – smoke arising from burning end of cigarette and exposure to this smoke is side stream smoke. Non-smokers are exposed in work places, public transport and indoor spaces.
Older people with weak immune system and people that are addicted to tobacco products are more exposed to carcinogenic affects of tobacco.
Impacts of smoking manifest in the form of several diseases. The diseases that are directly linked to inhalation of carcinogens in cigarette smoke are:
a) Cancer of lung, mouth, larynx, esophagus, uterine cervix, breast, stomach. Smoking increases the risk of breast cancer in women who used tobacco at an early age.
d) Pregnant women’s and infant health are also affected by smoking. An adverse impact of maternal smoking causes pregnancy complications and birth defects. Intra uterine growth retardation, spontaneous abortion, fetal and neonatal death, and abruption of placenta, premature rupture of membrane, preeclampsia, congenital malformation, low-birth weight, and recurrent respiratory infection in children. Passive smoking causes asthma, bronchitis, ear infections and pneumonia, in infants and children. Eye irritation is common when exposed to passive smoking. It aggravates allergies. Increased risk for lung cancer and coronary artery disease develops in people who live in close contact with the smokers.
Risk Reduction:
Risk declines only with complete cessation of smoking. Important factor for cessation of smoking is the desire of an individual to quit. Smokers that quit live longer than those who continue smoking. However, quitters too are at a higher risk for certain type of cancer than people who never use tobacco.
In order to substantially reduce smoking rates, governments can adopt a comprehensive approach to tobacco control, which should include a range of measures such as: (a) a total ban on tobacco advertising and promotion (b) restrictions on smoking in public places and in the workplace (c) sustained increases in tobacco taxation (d) bold health warnings on tobacco products (e) smoking cessation and health education campaigns (f) Protecting nonsmokers through restriction laws in work places, public transport and indoor public spaces. Public awareness campaigns should be made priority. It increases awareness and helps decline many adverse health impacts of tobacco use.
Cholera is an intestinal infection caused by a bacteria Vibrio cholerae, which is gram negative comma shaped rod. The Seventh Cholera pandemic began in 1961, started in Indonesia, spreading rapidly elsewhere in eastern Asia, and from there to India and Bangladesh, the USSR, Iran and Iraq. In 1990s it reached Peru and has spread throughout South and Central America. Vibrio cholerae, biotype El Tor, that is responsible for pandemic is more resistant than the classical vibrio. In 1982 the classical vibrio began to reestablish itself in Bangladesh where, in 1992, a new pandemic began, with a new serotype 0139 (Bengal Vibrio cholerae 0139). Many major cholera pandemics have affected countries across the world. An outbreak of Cholera is often linked to contaminated drinking water. Cholera habitats are in the valley of the Ganges and other great rivers of the Far East where the humidity and the increasing population contribute to the disease.
Cholera can spread quickly in areas where there is poor sanitation and where water supplies are tainted. Food contamination by flies or hand, and shellfish also transmit the infection. The bacterium is part of the flora of slightly salty water and when this water somehow mixes into the drinking supply then an outbreak of cholera can start. The bacteria survive for up to 2 weeks in fresh water and 8 weeks in salt water. The development of an infection from the time the pathogen enters the body until signs or symptoms first appear is from a few hours to 5 days.
The main route of transmission is Fecal- oral. It rarely spreads by person-to-person contact. The bacteria are passed in stools or vomit of the patient with cholera which remains in their feces for up to a fortnight and contribute to the illness. The bacteria multiply in the lumen of the small bowel and are non- invasive. They adhere to the mucosal surface and secrete exotoxin, which stimulates the adenylyl cyclase- adenosine monophosphate pathway of the mucosa which results in an outpouring of small bowel fluid. Upto 15 liters of watery diarrhea may be passed each day.
It causes severe diarrhea without pain followed by vomiting suddenly. Once the fecal content of the gut have been evacuated the typical “rice water” material is passed which consists of clear fluid with flecks of mucus. This enormous loss of fluid from the body leads to severe dehydration and muscle cramps. This intense dehydration is the cause of death particularly among children and elderly, as they are vulnerable to the dangerous dehydration. Some symptomatic cases are hard to distinguish from other illnesses that cause diarrhea. Only one in 10 cases shows the severe symptoms such as dehydration.
Diagnosis is made by stool microscopy and culture so that an outbreak can be brought rapidly under control. Stool culture or rectal swab isolates the bacteria and can be viewed under microscope, the bacteria has a characteristic movement. Clinical diagnosis is usually easy during an epidemic.
Treatment of this condition requires strict barrier nursing, replacing the fluid and salt losses. Normally, rehydration salts are the only treatment given, although severely dehydrated patients may need intravenous fluids. Antibiotics like tetracycline is given, which reduces the fluid loss.
A well-organized response to cholera can reduce death from cholera epidemics. However, the clean water and rehydration salts required are often in short supply in areas where they are needed most. There are two types of oral cholera vaccine but is used only for travelers and is not used at a community hit by cholera. Control of an epidemic is difficult in a community unless clean water supplies can be restored.
Alleviating these severe effects requires only simple measures. Drinking boiled or treated water, cooking practices needs to be made safe where possible and practicable, all food needs to be cooked well and eaten while hot, avoid shell fish, peeling all raw fruits and vegetables. Hand washing after going to the toilet is a vital measure to prevent the spread of the disease.
The establishment of proper sanitation system for proper and hygienic disposal of human waste is a must. Control of water sources contamination, and of population movement and public education are most important in an epidemic.
Everyone carries the BRCA 1 and 2 genes, but it is only when you inherit a faulty copy of the gene that you are at higher risk of developing certain cancers, including breast and ovarian cancer.
If you do inherit a faulty copy of the BRCA gene, you have an up to 80% higher risk of developing breast cancer than other women.
Only 5 to 10% of the 46,000 new cases of breast cancer diagnosed each year are due to genetic causes.
It’s also called as Lyme borreloisis. Lyme disease is most common vector borne disease in US.
Mode of transmission: Tick bite (vector)
Causes: Lyme diseases. Borrelia burgdorferi is transmitted by bite of an infected black legged tick.
Reserviour of an organisms consist of small mammals like white mouse, blood of birds upon which the tick feeds, ticks usually feeds during summer when there is higher incidence of disease. Tick feeds 24-48 hrs to transmit an infectious dose. Feeds on human who enters into the tick’s wood canal habitat. Organisms spread from bite site through the surrounding skin followed by dissemination via’ the blood to various organs like heart, joint, CNS. Classic symptom is erythema chronicum migrans, an expanding “bull’s eye” red rash with central clearing
There are 3 stages of Lyme diseases.
Stage 1- erthema chronicum migrans, flu- like symptoms.
Stage 2- neurological and cardiac manifestations.
Stage 3- auto immune migrating polyarthritis affecting the large joints of the knee.
Prevention.
-prevention centers on wearing protective clothing, socks and long trousers, avoiding sitting on the grass ,use of insects repellents to the exposed areas of the skin as precaution.
- Examining the skin carefully for tick bite is very important as it feeds for 24-48 hours to transmit an infectious does.
-protection measures for hikers, campers, or those living in tick infested areas.
