Seroconversion rates following 2 doses of measles- mumps- rubella vaccination given at the ages 12 and 18 months: data for possible additional dose at older age

12个月和18个月龄接种两剂麻疹-腮腺炎-风疹疫苗后的血清转化率：年龄较大时可能需要额外接种一剂的数据