My question is why doesn't Argentina *invent* and manufacture its own vaccine.
I believe there was an effort, maybe it's fizzled out. I can search if there's any interest, but in any case, I think the time for new COVID vaccines has passed. We already have amazingly good mRNA vaccines (BioNTech / Pfizer, Moderna), and an incredibly good Adenovirus vaccine (Sputnik), all of which way exceed any possible expectation we might have had a year ago. Oxford / Astra Zeneca and J&J are also very good, if stalled because of adverse reactions at the moment. Personally, I'd take any of them.
The classical inactivated virus approach seems to perform poorly by comparison (SinoVac in particular, SinoPharm hasn't demonstrated comparably poor results yet, though I've read here that a trial is happening in Peru, of all places).
There was some work in Argentina on equine serums, which is apparently a thing, bajo_cero posted about this I believe, as well as some other developments here. Chile reported some results from alpacas recently as well. Also, it's a big step from killing the virus in the lab (think detergent and ultra-violet light) to something that will work in humans. From my extra-curricular reading, I think antivirals, monoclonal antibodies, are the the next thing, I see Cuba, Israel, and the UK are working on on pills you can take to stop this thing in its tracks.