I'm surprised that the soaps haven't mentioned coronavirus (I know holby city has). They have in the past inserted other important subjects at the last minute in the past
When it's a one-off finished situation like a sports or election results, celebrity death, etc, that won't have an impact on stories, it's easy, but with a developing situation that's likely to go on for months it's probably safer to avoid mentioning it at all, otherwise you're just drawing attention to the fact that you're not including it in storylines.
That said, it would be a perfect explanation for the current fad of block storytelling that sees half the cast disappearing for weeks on end.