I saw 3 patients and myself whom have vaccinated on December's first week and have fever, myalgia, flu clinics one month later with laboratory confirmed influenza. How can it be explained to see flu in vaccinated people?
How well will flu vaccines work this season?
Influenza vaccine effectiveness (VE) can vary from year-to-year among different age and risk groups and even by vaccine type. How well the vaccine works can depend in part on the match between the vaccine virus used to produce the vaccine and the circulating viruses that season. It’s not possible to predict what viruses will be most predominant during the upcoming season. CDC monitors circulating viruses throughout the year and provides new and updated information about the vaccine match as it becomes available. Information is published weekly in FluView and summarized at intervals in the Morbidity and Mortality Weekly Report (MMWR). Vaccine effectiveness estimates are also provided when they become available.For more information about vaccine effectiveness
https://www.cdc.gov/flu/professionals/vaccination/effectiveness-studies.htm
CDC’s adjusted overall VE estimate against influenza A and B viruses for all ages was 47%. The overall VE against A(H1N1)pdm09 was 41% and the overall VE against influenza B was 55%. This data is consistent with VE observed during previous seasons when vaccine viruses and circulating viruses were similar. These vaccine effectiveness estimates were derived from data collected from the U.S. Flu VE Network from November 2, 2015, through April 15, 2016.
Hi Dilek
Flu symptoms did not mean 100% the infection with influenza virus, there are several types of other viruses can cause similar illness, and the most important that the CDC and other epidemiological scanning centers in all over the world can predict the virus strain wich will be the most spreading strain, for influenza and the parainfluenza there are high viral strain variations, so simply you may got another strain or even another virus infection
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