The primary health concern from wildfire smoke comes from the amount of very fine particulates in the air, smaller than 2.5 microns in diameter. The measure of this is commonly abbreviated as PM2.5.
...Medical researchers have also linked SARS-CoV-2 to lingering complications in multiple organs and systems, and some recent work has found that new-onset cholesterol problems may be an under-recognized but common complication of COVID-19.
Two studies published today measure the vaccine effectiveness (VE) of COVID-19 vaccines against laboratory-confirmed Omicron variant and subvariants and symptomatic disease. Vaccines that target the newer variants performed well, but primary vaccines offered rapidly waning protection from SARS-CoV-2 infections in the post-Omicron era.
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