So the fever arrived after the virus was allowed to replicate for the 3-4 days and take over. Are you doing routine sanitation of mouth and nose? We all have some degree of mucosal protection so that nominal viral entry is managed well. That protection has a degree of limitation that gets aided by the sanitation steps, no matter how many pathogens arrive.
Haha a whopping load is when you go from completely fine to full blown fever and chest infection in a day with no cough or sniffles in-between.
So the fever arrived after the virus was allowed to replicate for the 3-4 days and take over. Are you doing routine sanitation of mouth and nose? We all have some degree of mucosal protection so that nominal viral entry is managed well. That protection has a degree of limitation that gets aided by the sanitation steps, no matter how many pathogens arrive.
Your grandmother already knew this stuff.