Absolutely!!!Two years ago Ryan caught the flu from his sister. It was so severe that we ended up in the hospital with an adrenal crisis. He had to stay in there for four days. They had to drill into his bones to hydrate him because his veins had collapsed due to dehydration. We started the flu shots the very next year and have yet to have any kind of vomitting or diahrea since then, with the exception of one time on vacation in Cape Cod, but I am sure that was due to something he had eaten. Nobody in my family has any adverse reactions to the flu shot so it is a slam dunk for us. I don't know what I would do if we did. Take care, Lynn