I flew from Cancun to SEA in the beginning of January 2020. Lots and lots of people did. Did those engineers get sick, before you were symptomatic, and had you

I flew from Cancun to SEA in the beginning of January 2020. Lots and lots of people did. Did those engineers get sick, before you were symptomatic, and had you had close contact with them (meetings, dinners, etc)? And did you have the characteristic loss of taste/smell? If you can answer 'yes' to all of those (including that they were definitely sick with the correct timeframe) then you've got at least a better case than most people who got sick in Jan 2020. But even given someone who had visited Wuhan in early Jan and had respiratory symptoms, it is more likely that it wasn't SARS-CoV-2 and it was just normal influenza/cold-like viruses. And you can definitely have allergies get worse as you age, late 20s is probably when mine got bad, and they've gotten worse over time and I get sore throats now and they feel nearly like a cold. My Birch allergy got really noticeable sometime in the last 10 years. Get an allergy test, though, and see.