This idea that Europeans taking a booster or a fraction of American kids taking a fraction (1/3rd) of a Pfizer dose is taking vaccines away from other countries is not supported by the data.
The fragility, limited shelf-life and wastage of Moderna and Pfizer vaccines is a feature, not a bug.
$MRNA $PFE
The West's (one sided) loyalty to the mRNA vaccines, despite a non-negligible resistance to the platform from some patients & parents, some rising contraindications & undeniably increasing prices, loyalty to the point of cancelling orders from other companies, is almost comical.
Countries basically create a vaccine duopoly themselves, with their own research ( $MRNA) or gov funding (OWS), then with their own orders, then making it the only recognized vaccine for foreigners' vax-pass, then complain of duopoly tactics & higher prices. #SelfInflicted
Why SARS-CoV was more virulent than SARS-CoV-2
(part of the reason, temps, replication kinetics) and why temperature won't tell us a lot about origins or intermediary animals.
But just because it transmits in the air doesn't mean that it needs to be a (cool temp) respiratory infection. Could be an enteric one in the animals, where it's hotter.