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“Colds” would be by far the most numerous of the pathogens you list, and with over 200 possible viruses to choose from, and in far greater aggregate numbers than COVID-19*, testing to confirm colds cases would be impossible.

*Back in Sept., my teenage daughter brought home a “bug”, and my wife and I got it too. Early on the symptoms were “COVID-19-like” enough, and we have some at risk family members normally in contact, that the 3 of us all got tested. At least at that time and testing location, as I understood it, one had to either have symptoms, or, exposure to someone who had tested positive AND a risk factor (oneself’s or a person close to oneself) to be tested, or be a caregiver / “frontline” worker. However, most frontline workers and such were tested through their employers, one way or another, not at this test site. I asked the young lady we handed our filled out paperwork to how many people being tested said they were symptomatic: She characterized it as “most”.

We all tested negative, but my daughter got fairly sick, my wife less so, and I was pretty well clobbered for a day and a half, then felt better but took a long time to get rid of the chest cough.

A low estimate of “most”, it seems to me, would be around 60%. Disallowing ALL the other 40% entirely, and with positivity rates for COVID-19 in this area hovering around 10% for some time now, that leaves us to conclude approx. 50% of the tests were of people at the time symptomatic of “something” on your list, mostly colds.

One can argue this 50% is too high, however, we have not yet added in all cases of colds (etc.) that are very mildly symptomatic, asymptomatic, or the person simply did not get tested for whatever reason. So, I’ll run with that 50%. Multiply that by tests given to date = 0.5 x 251,765,894 (per Worldometers) = 125,882,947 people tested with symptoms of “something”, but the test indicated it was not COVID-19.

This would indicate colds are down in numbers, most likely due to COVID mitigation (which BTW should really crash flu numbers), and we are lacking Jan. and Feb. numbers (and most of March and April, really), but, significant numbers of colds are certainly still around.