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| Blood | Stool |
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| HIV ELISA, type 1 and 2 | Clostridium difficile toxin by PCR |
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| HAV IgM | Routine bacterial culture for enteric pathogens (E. coli, Salmonella, Shigella, Yersinia, Campylobacter) |
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| HBsAg, anti-HBc (both IgG and IgM), and anti-HBs |
Culture for Listeria monocytogenes and Vibrio (parahaemolyticus and cholerae) |
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| HCV Ab | Cryptosporidium antigen |
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| RPR | Acid-fast stain for Cyclospora and Isospora |
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| Giardia antigen | |
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| Ova and parasites | |
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| Rotavirus via EIA | |
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