You can eat crayfish after taking the nine-valent, but it is not recommended for those who are allergic to crayfish. Nine-valent refers to the nine-valent HPV vaccine, which is mainly used to prevent precancerous lesions or atypical lesions such as cervical cancer caused by HPV infection, and is suitable for women aged 16 to 26 to be vaccinated. After vaccination, there are mainly pain and swelling at the vaccination site, and adverse reactions such as dizziness, nausea and muscle pain. Contraindications after vaccination are mainly avoiding water at the vaccination site and avoiding pregnancy within six months. Crawfish is not an absolute contraindication after vaccination with the nine-valent HPV vaccine, so you can eat crawfish after the nine-valent HPV vaccine. However, if you are allergic to crayfish, it should be prohibited. If serious discomfort occurs after vaccination or after eating crayfish, you should seek medical attention.