Which statements regarding hepatitis B are correct (Select all that apply)?
a. Hepatitis B cannot exist in a carrier state.
b. Hepatitis B can be prevented by hepatitis B virus vaccine.
c. Hepatitis B can be transferred to an infant of a breastfeeding mother.
d. The onset of hepatitis B is insidious.
e. Immunity to hepatitis B occurs after one attack.
ANS: B, C, D, E
The vaccine elicits the formation of an antibody to the hepatitis B surface antigen, which is protective against hepatitis B. Hepatitis B can be transferred to an infant of a breastfeeding mother, especially if the mother's nipples are cracked. The onset of hepatitis B is insidious. Immunity develops after one exposure to hepatitis B. Hepatitis B can exist in a carrier state.
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When is tetragenesis most likely to occur?
a. 20 days after fertilisation b. 2nd trimester c. 20–56 days after fertilisation d. 3rd trimester