Most people I know have been self-quarantined and taking safety measures... so of course they aren't getting sick nearly as much as they used to. Schools aren't in session like they used to be and hospitals are still social distancing to a heightened extent. So most places that act like flu and cold incubators aren't providing the germs with room to grow, expand, and infect... or act like the contagions that they are.
In the US flu shots are typically given around October. I got my flu shot last year and there is still a while yet before flu season starts for this year.