A 25-year-old man is suspected of having viral hepatitis. Blood tests reveal that his blood contains antibody directed against the hepatitis B surface antigen (anti-HBs) but does not contain hepatitis B surface antigen (HBsAg).
What do these results indicate? A. The subject has a hepatitis B infection.
B. The subject has had a hepatitis B infection some time in the past and is immune, or the subject has been immunized against the hepatitis B virus and is immune.
C. The subject never had hepatitis B or a hepatitis B immunization, but may have hepatitis A.
D. The subject probably has infectious mononucleosis.
Question 2
The ability of the body's defenses to fight off a pathogenic organism depends on both the virulence of the organisms and the resistance of the infected person.
Indicate whether the statement is true or false
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