No, it doesn't mean the vaccine is ineffectual. It means it loses potency after a while. The antibodies it helps generate don't last forever in the body. Also t

No, it doesn't mean the vaccine is ineffectual. It means it loses potency after a while. The antibodies it helps generate don't last forever in the body. Also there are several variants of the virus around. The vaccine was most effective against the first version of the virus.