OK, sorry if it sounds like a stupid post, but I have not been on this thread in a long time, and I searched, but the results from search engines only refer to a company that has announced an antivirus coating (not computer, for real virus, though it could have been a "COVID marketing" thing), so, it is the WEG virus a kind of joke, or are you really referring to a sickness I am unfamiliar with ?He beat cancer only to get infected with the WEG virus. Looks like this time it's terminal.
You are also referring to cancer, and cancer itself, and the therapies used to treat it, unfortunately affect the immunitary system as well, especially in cases like e.g. full body irradiation, which can bring easily to be infected, especially if it is something endemic in the area.