write use of vaccinations
Answers
Answer:
A vaccine provides a controlled exposure to a pathogen, training and strengthening the immune system so it can fight that disease quickly and effectively in future. By imitating an infection, the vaccine protects us against the real thing. Beating disease is not easy.
Answer:
There are two basic points of vaccines:
Training mode for the immune system
Herd immunity
Vaccines work on giving the patient something like the problem posed to their immune system by the disease they are vaccinating against, without having it be actually as dangerous as the real thing. The textbook original vaccine, cowpox is a disease that in many ways behaves like smallpox - but is nowhere near as fatal. Some vaccines are the mildest form of the disease anyone has found (the ‘live polio’ vaccine is one of these) while others are outright dead - but still force the immune system to develop the tools to get rid of them. This is like a training excercise for the immune system but with the red team using paintball guns rather than actual bullets - or the training level in a video game. And when the real enemy turns up the immune system already has been through the training excercise and has the tools it needs to hand just in case the thing comes back so the disease is much easier to fight off.
Herd immunity is the second half of the purpose of vaccines. It turns out that even if you aren’t vaccinated or vaccines don’t work for you, if you never meet a person carrying a specific disease you are incredibly unlikely to catch that disease yourself. So with enough systematic vaccination you can throw the disease right out of the population. And it works.