| Name | Children | Media (from resource) | Traits |
|---|---|---|---|
| Uranotaenia sapphirina (Osten Sacken 1868) | 0 | 2 | 0 |
| Ureaplasm urealyticum | 0 | 6 | 0 |
| Veillonella | 0 | 1 | 0 |
| Vesiculovirus | 0 | 2 | 0 |
| Vibrio cholerae | 0 | 4 | 0 |
| Vibrio vulnificus | 0 | 1 | 0 |
| Vitis | 0 | 6 | 0 |
| Wangiella dermatitidis McGinnis 1977 | 0 | 5 | 0 |
| Wuchereria bancrofti (Cobbold 1877) | 0 | 1 | 0 |
| Wyeomyia | 0 | 3 | 0 |
| Wyeomyia smithii (Coquillett 1901) | 0 | 1 | 0 |
| Xenopsylla | 0 | 5 | 0 |
| Xenopsylla cheopis (Rothschild 1903) | 0 | 4 | 0 |
| Xylocopa virginica (Linnaeus 1771) | 0 | 17 | 0 |
| Yersinia enterocolitica | 0 | 5 | 0 |
