Biology, asked by shwetaaa, 1 year ago

Name any three different vaccines and the diseases for which they provide immunity.

Answers

Answered by MdMimAkhtar
5
A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe or its toxins. The agent stimulates the body's immune system to recognize the agent as foreign, destroy it, and "remember" it, so that the immune system can more easily recognize and destroy any of these microorganisms that it later encounters..

Hepatitis A vaccine
HPV vaccine
Influenza vaccine
Measles vaccine, MMR vaccine, MMRV vaccine
Etc....

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Answered by vcgmail
4
Hepatitis B
In order to develop immunity to hepatitis B infection, one needs to produce antibodies to the surface protein (surface antigen) or outside coat of the virus that encases it. The hepatitis B vaccine therefore contains only the viral surface antigen known as hepatitis B antigen (HBsAg for short).It is important to have at least a month between vaccine doses and to make sure that children get all three doses of the vaccine to get a good immune response.
Who should be vaccinated against hepatitis B?
Hepatitis B is very prevalent in children and adults in South Africa, and is highly infectious. About 10% of people who get hepatitis B become chronically infected, with increased risk of kidney disease, liver cirrhosis and liver cancer.
High risk groups for hepatitis B include:

Health care workers
Family and close contacts of hepatitis B carriers
Anyone with more than one sexual partner
People with renal failure receiving haemodialysis
Haemophiliacs and others who require frequent blood products
Intravenous drug users
Babies of mothers who are infected with hepatitis B should receive the vaccine and hepatitis B immunoglobulin at birth. This has been shown in the published literature to be the most effective way to prevent transmission of hepatitis B infection from the mother to her infant. However, in South Africa, it is too expensive for the government to provide routine blood tests to screen mothers to check their hepatitis B status and then to also administer hepatitis B immunoglobulin at birth to the infant. This option is therefore only available to mothers and infants being treated at private health care facilities.

Who should not be vaccinated against hepatitis B?
Persons who have severe allergy to baker’s yeast should not receive the recombinant vaccine.
If you or your child is extremely ill when the vaccine is due, you can delay vaccination until the child has recovered.


Rabies
Most people who receive the rabies vaccine do so after potential exposure to animal rabies, usually through animal bites. Not all animal bites result in rabies (the animal must be carrying rabies), and there are guidelines as to when vaccination is necessary. However, rabies is fatal in almost every case, so the vaccine should be given even if there is only a small possibility of exposure. Rabies vaccine is available at public hospitals and through district surgeons.


Who should receive the rabies vaccine?
A person bitten by an animal should consult a health care professional as quickly as possible after the incident, and this should include an assessment of rabies risk. About 10 to 20 human cases of rabies occur in South Africa every year because people fail to seek or receive correct preventive treatment after an animal bite.

Polio
Over 2000 polio cases were reported in Africa in 1995. An outbreak occurred in Namibia in 1993, with over 50 cases and again in 2006. Although South Africa's last case of polio was notified in 1991, this country has not yet been declared polio-free by the WHO, and therefore surveillance for the disease continues.


The polio vaccine used in South Africa is the live or “Sabin” vaccine, received orally as “polio drops”. There are three strains of polio, and the vaccine protects against all three, so it is sometimes called “trivalent oral polio vaccine”. The polio vaccine is a weakened form of the natural or “wild” polio virus, which does not cause the disease polio. The vaccine prompts the immune system to produce antibodies in the gut and blood, so that if the wild polio virus should ever enter the gut, it is immediately neutralised and cannot migrate to the brain.

An alternative polio vaccine, the “Salk” vaccine, is used in some European countries and, recently, in the USA. This is a killed virus vaccine, given by injection. However, the Sabin vaccine carries about a one in 750 000 risk that the live vaccine virus will revert to the virulent form, and cause polio in the vaccine recipient.



Who should get vaccinated against polio?
All children should receive oral polio vaccine and unvaccinated adults should receive the injectable polio vaccine.


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