| YCB | yeast carbon base |
|---|---|
| yd | yard |
| YDV | yeast-derived hepatitis B vaccine |
| YDYES | yin deficiency yang excess syndrome |
| YE | yeast extract; yellow enzyme |
| YEH2 | reduced yellow enzyme |
| YEI | Yersinia enterocolitica infection |
| Yel | yellow |
| YF | yellow fever |
| YFI | yellow fever immunization |