The answer about the vaccine ineffectiveness in the subsequent flu season is explained below.
Explanation:
Flu is basically a respiratory illness. This illness is contagious. This is caused through the spread of influenza virus.
There are almost 200 viruses that may cause influenza to a person. These viruses may also change over a certain period of time.
A person after getting vaccinated against the flu, is still susceptible to some kind of viruses that might have not covered in the recent vaccine, or those viruses might have changed over time and are not covered by the recent flu shots that you received. So this is the reason why a vaccine could be ineffective for certain viruses.
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