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yusuki yusuki
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9 years ago
Identify a major reason making it difficult to prevent the spread of hepatitis B.
a.   A vaccine is not available.
b.   The incubation period is too short to track contacts.
c.   Infection is often asymptomatic.
d.   Antibodies are not produced.
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monosaccharidemonosaccharide
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9 years ago
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yusuki Author
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#2
9 years ago
I was really having a hard time with this question, thanks for the input.
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9 years ago
No problemo Smiling Face with Open Mouth
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