Caliciviruses/Astroviruses
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Describe the general properties of these types of viruses?
Norwalk agent causes what type of infection, describe its transmission, and diagnosis?
Caliciviruses/Astroviruses are icosahedral, non-enveloped, resemble picornaviruses or star shaped, ss, +ve polarity. Norwalk agent probably accounts for up to 1/3 of all non-bacterial causes of gastroenteritis. Usually severe in older children and some adults. Cause winter vomiting disease. Transmission is via: faecal oral route, contaminated or eating raw shell fish, contaminated food and water, airborne transmission is also important. Diagnosis is by EM of stools.
Category: Microbiology Notes
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