A few years ago I did a lot of reasearch to find out what strengthens the immune system. Exposure to dirt or illness does not strengthen it, oddly enough. All such theories are based on one study involving families with children and a dog, not replicated or shown by any other studies.
Spanisho word of the day... pic.twitter.com/cjlhyePG2g— ilDonaldoTrumpo (@ilDonaldoTrumpo) April 25, 2021