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COVID-19
I meant to write sars-cov-2, but the points are related.
Scientists and the military have been studying viruses for a long time now, and even nasty bugs like smallpox, dengue and HIV don’t seem to cause the plethora of signs and symptoms associated with sars-cov-2 infection. Is your point that other similarly bad bugs haven’t had the same opportunity to show their capabilities? Or is it that we haven’t come across another virus as varied and unpredictable in its effects as sars-cov-2? It’s the second question I’m looking for an answer to.
(I know that ‘bad’ and ‘bug’ aren’t formal terms.)
COVID-19 is unique is that it’s the first global pandemic in a long time that affecting a staggering number of countries, moreso in an era of social media and people movement.
Point being; there’s nothing to compare this.