Thanks for the response. Yeah, I can see why having astronauts not get ill in space makes sense at the moment, and that for more long-term viability of living

Thanks for the response. Yeah, I can see why having astronauts not get ill in space makes sense at the moment, and that for more long-term viability of living in space humans are going to probably have to take their mess and germs with them. And also that lack of exposure to immune-challenges probably represents a net-negative effect on our well-being in this life and also reduced selection-pressure in the evolutionary sense. Quite concerning!