Diarrhea — Worldwide/Unknown
Human astroviruses (HAstVs), 1st identified in 1975, are now considered an important cause of viral gastroenteritis, predominately infecting children under 2 years of age. HAstVs are classified into 8 serotypes. A unique astrovirus, MLB1 (AstV-MLB1), recently was discovered in a fecal sample from a child with diarrhea in Australia; subsequently, at least 6 novel astroviruses have been discovered from fecal samples, including AstV-MLB2, AstV-MLB3, HMO AstV-A/VA2, HMO AstV-C/VA1, HMO AstV-B/VA3,
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