| LAIV | live attenuated influenza vaccine |
| WHO | World Health Organization |
| CDC | Center for Disease Control |
| NMPA | National Medical Products Administration of China |
| GCP | Good Clinical Practice |
| HHS | United States Department of Health and Human Services |
| AEs | adverse events |
| ARs | adverse reactions |
| SAEs | severe adverse events |
| SS | safety set |
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