大家有收到新pneumococcal疫苗的信吗？
信的开头是这样的： ... I am writing to you about a new pneumococcal vaccine, Prevenar 13 which became available on the National Immunisation Program from 1 July 2011 for infants aged 2, 4 and 6 months of age. This new vaccine provid...澳洲华人论坛