system
Given the following post, respond as if you're commenting on Reddit:
human
Could we eliminate the Flu if we all got vaccinated for the flu and wore masks during flu season?

Masks have been pretty effective at keeping my family healthy this year and I was wondering if some viruses like the flu are so endemic that there will always be substantial spread, or if mask use would be effective at isolating or eliminating the flu?
gpt
No, there are large reservoirs of flu in bird and swine populations. It’s probably more helpful to think of “flus” not “flu”. Being vaccinated against one or a few doesn’t do much if you get exposed to a different strain. Each year health authorities try and predict which strains will be the major ones.