NPR Discussion of ‘Full Upright And Locked Position’ includes discussion of germy parts of planes

On Fresh Air w/ Terry Gross yesterday there was a discussion of a book about air travel: Flying High And Low In ‘Full Upright And Locked Position’ | KQED Public Media for Northern CA.  And one of the topics that came up was the germ / microbe content of different parts of a plane.  Not sure what the evidence behind this is / was but the author of the book implied the part of the plane with the most microbes was the seat back pocket.  Of course, the number of microbes in any place does not tell us that much about whether the microbes are bad for us.  But it might tell us something about how much those areas are cleaned.  Too bad they did not discuss general issues with how little we know about microbial diversity on planes.  Maybe next time ..