There is a hepatitis B vaccine that is effective at preventing ...

[B]

There is a hepatitis B vaccine that is effective at preventing infection with the virus.
 
  Indicate whether the statement is true or false.

Question 2

James suspects he has been exposed to HIV after engaging in unprotected sex. Two weeks following the unprotected sex, James has a blood test for HIV,the results of which are negative.
 
  Thus, James can almost be certain that he is indeed HIV negative, because false negatives for HIV are very rare.
 
  Indicate whether the statement is true or false.

[pangili4]

Answer to Question 1

ANS: T

Answer to Question 2

ANS: F