Td needs boosting dose, second and maintenance dose.

来源: pharmacyelite 于 2007-06-21 12:58:11 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (216 bytes)

To produce an effective & stable level of antibodies up to 10 years. Only a boosting dose won't last long.
However, for immigration purpose, you need at least to show the first shot.
MMR is only one-time shot.

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