我知道的轮状病毒疫苗都是口服的, 9个月好像有点晚了.官网上看到的: RotaTeq The vaccine is given by mouth. Your child will receive 3 doses of the vaccine. The first dose is given when your child is 6 to 12 weeks of age, the second dose is given 4 to 10 weeks later and the third dose is given 4 to 10 weeks after the second dose. The last (third) dose should be given to your child by 32 weeks of age. Rotarix Your baby will get the first dose at around 6 weeks old. The second dose will be at least 4 weeks after the first dose (before 6 months old). Be sure to plan the time for your baby’s second dose with the doctor because it is important that your baby gets both doses of ROTARIX before your baby is 6 months old.