Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Lokaci: Tsarin alurar riga kafi na yara a Amurka shine allurai biyar tsakanin watanni 2 da shekaru 15. Ga manya, ana ba da shawarar Td boosters kowane shekaru 10.  Tambaya: A wane shekaru ne yara a Amurka suke fara samun rigakafi?
Watanni 2