From bafflement to understanding in a couple of hours: As explained just below in "Why the spike?", I saw a sudden surge in hits coming via Google and other search engines. Several visitors have explained that it was the result of watching the program on ABC News that I'd mentioned just a little earlier today.
Apart from feeling a renewed respect for the mainstream media, I'm encouraged that so many people took the trouble to try to learn more than the program itself could offer. Make yourselves at home, folks. I hope some of the resources here, especially the links to other flu blogs and news outlets, will be useful to you.