Whooping cough is very prevalent just now.百日咳正在广泛流行.Measles, mumps and whooping cough are spreading again because children are not being vaccinated.因为孩子们没接种疫苗，麻疹、腮腺炎和百日咳又蔓延开来。Have you had your child vaccinated against wh...
Measles, mumps and whooping cough are spreading again because children are not being vaccinated.因为孩子们没接种疫苗，麻疹、腮腺炎和百日咳又蔓延开来。Whooping cough is a serious respiratory disease caused by Bordetella pertussis.百日咳是一种由百日咳杆菌引起的严重的...