161q: which one is the best indicator for hepatitis B infection in a community ?
a. hepatitis B surface antigen
b. hepatitis B surface antibody
c. core antibody
d. core antigen
162q: true regarding dengue fever is all except ?
a. hemorrhagic tendency
b. spontaneous remission
c. transmitted by anopheles mosquito
d. fever is saddle back type
163q: specificity increases with ?
a. increase in false positive
b. increase in false negative
c. increase in true positive
d. increase in true negative
164q: sensitivity is ?
165q: the ratio between incidence of disease among exposed and non-exposed is called as ?
a. relative risk
b. odds ratio
c. attributable risk
d. none of the above
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