Adapted from George et al. [39] and Provan et al. [8].

^a)Test in selected cases.

Abbreviations: CNS, central nervous system; DTaP, a vaccine for diphtheria, pertussis, and tetanus; GI, gastrointestine; GU, genitourinary; MMR, measles-mumps-rubella combined vaccine; PCR, polymerase chain reaction.