Which marker is most specific for acute hepatitis A infection?

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Study for the Stevens Immunology-Serology Test. Hone your skills with flashcards and multiple choice questions, each enriched with hints and explanations. Prepare confidently for your exam now!

Multiple Choice

Which marker is most specific for acute hepatitis A infection?

Explanation:
Acute hepatitis A infection drives a rapid IgM antibody response to HAV. IgM anti-HAV appears early and is short-lived, making it highly specific for a recent or current HAV infection. In contrast, IgG anti-HAV indicates past exposure or vaccination and persists for life, so it doesn’t distinguish acute from prior infection. HBsAg would indicate hepatitis B, not HAV, and anti-HCV indicates hepatitis C exposure. Therefore, IgM anti-HAV is the marker that most specifically signals an acute HAV infection.

Acute hepatitis A infection drives a rapid IgM antibody response to HAV. IgM anti-HAV appears early and is short-lived, making it highly specific for a recent or current HAV infection. In contrast, IgG anti-HAV indicates past exposure or vaccination and persists for life, so it doesn’t distinguish acute from prior infection. HBsAg would indicate hepatitis B, not HAV, and anti-HCV indicates hepatitis C exposure. Therefore, IgM anti-HAV is the marker that most specifically signals an acute HAV infection.

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