Yes and no. There was no molecular biology (and therefore no PCR) and no antibody testing. We therefore might never have figured out 100 years ago how big a source of spread asymptomatic and presymptomatic people are.https://twitter.com/marklewismd/status/1332825665851199488 …
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Replying to @gorskon
I was thinking about this the other day: antibiotic casettes were some of the first selectable markers to be packaged in transposons. Without antibiotics, most of modern molecular biology would have been impossible, or at least significantly slower.
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