The academy has pushed back the age for the first of three hepatitis-B shots, which also contain thimerosal, from birth to two to six months in children whose mothers test negative for the disease.

• 因为含有硫汞撒，美国儿科科学院将母亲化验呈阴性的婴儿三次注射的乙肝疫苗的首次注射年龄从出生后2个月推迟到6个月。