Sure: Vaccines are rarely 100% effective, and sometimes the flu strain in circulation isn't the one that was predicted.
Answered 3/26/2013
5.7k views
A doctor has provided 1 answer
A doctor has provided 1 answer
6 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question