The flu season is coming upon us and experts are concerned this year could be particularly bad.

Last year’s flu shot was only 42 percent effective and a report released Monday suggests the reason why was due to a mutation in the vaccine strain. As doctors attempt to determine which virus will be the most circulated this year they will create the proper vaccine to respond to it.

UC Davis Medical Center Chief of Pediatric Infectious Diseases Dr. Dean Blumberg explains the value of the vaccine despite questions surrounding its efficacy.