Prince Charles ,diagnosed with Coronavirus

It’s such a new virus that even the scientists don’t know with certainly. However I also read very recently that it is believed that the amount of virus may determine how badly someone gets ill, just as BlueBelle says. But then there’s the age of the person, the general health of the person pre contracting the virus, the gender of the person, as more men get ill and die with it. There appears to be a lot of variables, which is why it’s confusing. Plus I understand symptoms can begin any time from two days to fourteen days after exposure, which must be where the fourteen days isolation comes from, which explains why Camilla is still isolating, but Charles is not because he’s now more than seven days after initial symptoms.
Have I got that right? If I haven’t I’m still confused.