OK, you want to rumble? ;-) Thirty years ago friends came back from traveling in Russia and staying in various hotels. They gave me and my husband big hugs. Less than 2 weeks later both my husband, I, and our two sons all had a case of scabies. We called them and they apologized profusely, as they also were afflicted. My husband and I got rid of our cases rather quickly, and I also did a lot of very hot laundering. Nevertheless, our boys continued to find an occasional jacket or shirt behind a chair or sofa, or under the bed, or in a toybox, so it took half a year before their cases were cleared. Boy, talk about from Russia with LOVE!
Sarcoptes scabei
https://dailyparasite.blogspot.com/2010/03/march-25-sarcoptes-scabei.html
Can't top that one!