For several years, I worked at the local nuclear power plant. Every year, we would have one or two outages, one in spring, one in autumn. Right around the time the weather starts changing. Anywhere from 1000 to 2000 employees would be hired for 30 to 45 days to work on the reactor. During these outages, a lot of germs were passed around. Nearly everyone was affected by the end of the outage. We always called it "nuclear flu", or "outage flu". I was lucky, because I had an office job, shuffling paperwork, and rarely had to venture into the reactor building, so I never did catch nuclear flu.