Question

Numerous agencies and companies are working to develop an effective vaccine for COVID-19. Although established vaccines (such as those for measles and influenza) are safe and effective for most people, there are individuals who should not be vaccinated. For example, people with AIDS, cancer, type I diabetes, or other health conditions often have weakened immune systems and cannot be safely vaccinated. How can vaccines help protect these individuals?

A. Resistance can spread through direct contact, allowing unvaccinated individuals to gain immunity by interacting with those who have been vaccinated.

B. Vaccines cannot help people with weak immune systems. Each and every person must be vaccinated if they are to be protected from the disease.

C.If enough people are vaccinated, the disease will be forced to evolve and individuals who were not vaccinated will be protected.

D.Individuals who are not vaccinated are protected, if enough members of their community are vaccinated so that the disease cannot spread.

Answer 1

D. Individuals who are not vaccinated are protected,if enough members of their community are vaccinated so that the disease can not spread.

Explanation-

Herd immunity applies to the above question, this is the another term for the community immunity which refers to the indirect protection from the disease .This is more likely to happen when large population is vaccinated against infection and becomes immune to the disease ,provides the protection for the people who are not immune to the disease. In this kind of immunity, the chian of infection gets disrupted and spread of disease either stops or slows down .