| Spezies | Risiko- gruppe | Bemer- kungen | Status |
| Yangia | |||
| Yangia pacifica | 1 | ||
| Yania → Yaniella | |||
| Yania flava → Yaniella flava | |||
| Yania halotolerans → Yaniella halotolerans | |||
| Yaniella | |||
| Yaniella flava (Yania flava) | 1 | ||
| Yaniella fodinae → Enteractinococcus fodinae | |||
| Yaniella halotolerans (Yania halotolerans) | 1 | ||
| Yaniella soli | 1 | ||
| Yeosuana | |||
| Yeosuana aromativorans | 1 | ||
| Yersinia | |||
| Yersinia aldovae | 1 | ||
| Yersinia aleksiciae | 2 | ||
| Yersinia bercovieri | 1 | ||
| Yersinia enterocolitica subsp. enterocolitica | 2 | Z | |
| Yersinia enterocolitica subsp. palearctica | 2 | Z | |
| Yersinia entomophaga | 1 | n | |
| Yersinia frederiksenii | 2 | Z | |
| Yersinia intermedia | 2 | Z | |
| Yersinia kristensenii | 2 | Z | |
| Yersinia massiliensis | 1 | ||
| Yersinia mollaretii | 1 | ||
| Yersinia nurmii | 1 | ||
| Yersinia pekkanenii | 1 | ||
| Yersinia pestis | 3 | V, Z | |
| Yersinia philomiragia → Francisella philomiragia subsp. philomiragia | |||
| Yersinia pseudotuberculosis | 2 | Z | |
| Yersinia rhodei | 1G | + | |
| Yersinia ruckeri | 1G | t2 | |
| Yersinia similis | 2 | Z | |
| Yersinia wautersii | 2 | Z | neu |
| Yimella | |||
| Yimella lutea | 1 | ||
| Yimella radicis | 1 | neu | |
| Yokenella – synonym: Koserella | |||
| Yokenella regensburgei – synonym: Koserella trabulsii | |||
| Yonghaparkia | |||
| Yonghaparkia alkaliphila | 1 | ||
| Youhaiella | |||
| Youhaiella tibetensis | 1 | neu | |
| Youngiibacter | |||
| Youngiibacter fragilis | 1 | ||
| Youngiibacter multivorans (Acetivibrio multivorans) | 1 | ||
| Youngimonas | |||
| Youngimonas vesicularis | 1 | neu | |
| Yuhushiella | |||
| Yuhushiella deserti | 1 |
| G | Auf eine abweichende Einstufung in der "Liste risikobewerteter Spender- und Empfängerorganismen für gentechnische Arbeiten" wird hingewiesen. |