what is vaccine 100 words
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Answer:
vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease.[1] A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, and to further recognize and destroy any of the microorganisms associated with that agent that it may encounter in the future. Vaccines can be prophylactic (to prevent or ameliorate the effects of a future infection by a natural or "wild" pathogen), or therapeutic (to fight a disease that has already occurred, such as cancer).[2][3][4][5] Some vaccines offer full sterilizing immunity, in which infection is prevented completely
Answer:
There has been confusion and misunderstandings about vaccines. But vaccinations are an important part of family and public health. Vaccines prevent the spread of contagious, dangerous, and deadly diseases. These include measles, polio, mumps, chicken pox, whooping cough, diphtheria, and HPV.
The first vaccine discovered was the smallpox vaccine. Smallpox was a deadly illness. It killed 300 million to 500 million people around the world in the last century. After the vaccine was given to people, the disease was eventually erased. It’s the only disease to be completely destroyed. There are now others close to that point, including polio.
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