Authorities reminded the public that those who are allergic to components of the vaccine or have serious allergies to vaccines are not suitable for the inhalable booster. People with epilepsy that is not under control, other progressive neurological diseases, and Guillain-barre syndrome are also not suitable for the vaccination.

Pregnant women and people who have fever, acute illness, ongoing chronic diseases or serious chronic diseases that are not under control should not take the booster shot.