You are correct it can take a longer time than usual for children with asthma to get over a chest infection, sometimes as long as 6 weeks.This is why children with asthma are sometimes given a short course of a safe cortisone syrup such as Prelone syrup for a few days to speed up the recovery process.The flu vaccination may cause a mild fever but is unlikely to cause the typical symptoms of a cold such as you have now.It sounds as if your baby also has a cold.
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