Some vaccines are given at birth at many others by two months and still others at 4 months (in the US). I am not aware of any test that can work that early. ht

Some vaccines are given at birth at many others by two months and still others at 4 months (in the US). I am not aware of any test that can work that early. https://www.cdc.gov/vaccines/schedules/hcp/imz/child-adolescent.html https://www.cdc.gov/vaccines/schedules/hcp/imz/child-adolesc...