On the other hand, a lot of diseases (including lifelong, autoimmune ones) are triggered, at least in part, by infections[0]. Without ever experiencing even a common cold, it stands to reason that some cases of those diseases could be precluded. Also, for the elderly, respiratory illness should be avoided because it puts undue stress on the cardiovascular system[1].
We need to be come robots[2]!
[0] https://www.labroots.com/trending/health-and-medicine/4999/a...
[1] https://www.cbsnews.com/news/flu-tied-to-heart-attack-risk-i...
[2] http://i.dailymail.co.uk/i/pix/2015/12/02/00/2EF55A550000057...