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Treponema pallidum
Trichomonas vaginalis
Trypanosoma cruzi
Ureaplasma parvum
Ureaplasma urealyticum
Usutu Virus
Vesicular stomatitis Virus
Vibrio (all species)
Vibrio cholerae (All subspecies)
West Nile Virus
Western Equine Encephalomyelitis Virus
Yersinia enterocolitica