Question

What are the uses of vaccines?

Answer 1

A vaccine is known as biological preparation which provides active acquired immunity to an infectious disease. A vaccine typically contains an agent that is similar to a disease-causing microorganism and made from killed forms of the microbe or toxins. The agent stimulates the body's immune system which recognizes the agent as a threat and destroys it and to further recognize and destroy any microorganisms associated with that agent. Vaccines can be prophylactic.

Complete answer:
Vaccination is the most useful way to prevent infection and outcomes caused by influenza viruses.
Vaccination is very important for people at higher risk of influenza complications, and for people who are high-risk individuals.
If most of the population is vaccinated, infections can’t spread from one person to another, which symbolizes that everyone has good protection – even those who don’t have immunity. This is called herd protection also called herd immunity.
It is very important because not everyone is directly protected with vaccines – some people are unresponsive to them or they might have allergies or health conditions.
Medicine depends on being able to treat infectious diseases with the help of antimicrobial drugs, for example, antibiotics, but overuse of these drugs can lead to infections becoming resistant to them.
By preventing infections would require drug treatments, vaccines reduce the opportunity for drug resistance to develop.

Note: Vaccines prevent approximately 2–3 million deaths worldwide every year. But, approximately 1.5 million lives could be saved annually if a better global vaccine is coverage.