Looking at the Google Trends graph I posted in the sibling comment - that would make so much sense.

Possible the higher instances are related to the fact that schools no longer do routine screening for lice. No more school nurse and no more chopsticks checks monthly means that they have a chance to spread amongst the kids before anyone notices.

Off topic, but Bill Bryson is such a fantastic author.

I grew up in a rural area in a second-world country, during the 90ies when the economy went from shitty to complete shit, and many people had to subsist on grazing, so to speak: I helped to plant (and then gather) potatoes, tomatoes and other vegetables in our backyard. But even then, lices were mostly something out of WW2-era stories, or something you'd get if you hanged out with local "wandering folk", I guess; I don't remember any lice cases in my school although we did have our hair checked in the elementary.

Then things generally improved and life is now much better; so what about the lices? According to the 2019 statistics, there were 200 cases of headlice per 100'000 children that year. Quite a number, but not a huge one, really.

So that's why I asked--if in a poor second-world country lices were almost a non-issue, then surely that means the rich first-world countries have managed to completely get rid off the lice, and much earlier, too? Right?