Hello! i need with this question.
a 40-year-old woman received a vaccine for measles, mumps, and rubella when she was a child. she plans to travel to a country where measles is prevalent. her doctor recommends that she should be tested for measles immunity. which of the following best describes evidence that the vaccination has given her immunity to measles?

a diagnostic testing would show evidence of symptoms specific to measles, like fever and rash.
b blood tests would show that she has the measles-specific antigens in her blood.
c high white blood cell counts would demonstrate her specific immunity to measles.
d. presence of measles-specific antibodies in her blood would show she has measles immunity.

Ans.

Vaccines represent a biological preparation, prepared by inactive or dead for m of microbes or their pathogenic components to develop acquired immunity against those microbes. Vaccines stimulate antibody producing immune cells or B lymphocytes to provide immunity against the particular pathogen.  

These cells form antibody producing memory B-cells that remember that pathogen and produce more effective antibodies against it with a faster rate in future infections.

As the woman has received vaccine for measles during her childhood, she will show presence of measles-specific antibodies in her blood as evidence that the vaccination has provided her immunity against measles. Thus, the correct answer is option d).

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!