The positive result of Salah is the bad news for Liverpool but I don't think The Kop and Klopp will get much troubles with a few missed matches of Salah. Jota can be a good alternative for Salah. In recent matches, with very good form of Jota, I read people wanted Jota to replace Mane. The sudden infection of Salah brings a chance for Klopp to build up another team without Salah and also test the ability of Jota when he has to start match under pressure.
I think Jota can do his works well.
Liverpool won't be the only team to lose it's top players. I think that due to covid19 many teams will be forced to search for the replacements and use the young players. so we will see many surprising results ahead.