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Hepatitis A virus antigen was purified from early acute-phase chimpanzee stools by a rapid three-step procedure using 7% polyethylene glycol precipitation, CsCl banding, and Sepharose 2B column chromatography. Electron microscopic examination of the hepatitis A virus entigen preparation revealed highly purified hepatitis A virus particles.

Purification of hepatitis A virus from chimpanzee stools