The shedding is, unfortunately, real. My husband experienced illness after seeing the vet and his doctor in the same day - 24 hours later had a 6-8 hour "flu" with temp, shivers, shaking, cold, sweating which broke after 6-8 hours and was done. (Never heard of a 6 hour flu. When we had what was presumably covid in early 2020, same symptoms, took 3-4 days, then a week to recover) A couple days later he had what turned out to be shingles affecting the left side of his face, including eyeball. Opthalmologist confirmed it, and he's now on antiviral and steroid treatment.
All from a 2 hour exposure! He was a bit weakened from a non-healing surgical wound that had been infected, but he also has had shingles before AND was vaccinated against shingles. Go figure.