Hello Thanks for writing to HCM Kids taking antibiotics for a moderate or severe illness should not get vaccinated until they recover from the illness — but this applies to all children who are sick, not just those who are taking antibiotics. That s because it can be hard to figure out whether symptoms like a fever following a vaccination are a side effect of the vaccine or due to the illness itself. As soon as a child is feeling better, even if he or she is on antibiotics, the vaccine can and should be given. If you re concerned about your child s health and the safety of getting vaccinated, talk to your doctor or the person administering the vaccine Hope this helps Take Care.