I’m not sure that prophylactics really would be the deciding factor. Condoms are older than you might think, but on the other hand usage rates are still relatively low.
And humanity keeps bouncing back from things: for example, the plague (multiple times!)
I think the relatively long incubation time is probably what would have made it especially bad if it had taken hold earlier - say, in the 1800s when our understanding would have been limited and our ability to track it worse. It might have been much, much worse then.
I’m not sure that prophylactics really would be the deciding factor. Condoms are older than you might think, but on the other hand usage rates are still relatively low.
And humanity keeps bouncing back from things: for example, the plague (multiple times!)
I think the relatively long incubation time is probably what would have made it especially bad if it had taken hold earlier - say, in the 1800s when our understanding would have been limited and our ability to track it worse. It might have been much, much worse then.