New APPS

With reference to malaria tracking, I've tried to suggest some of the reasons we don't really know what "Covid cases" means, either insofar as that is measured by positive tests (because we don't know how many more cases there are beyond the tested ones, so tested cases is at best an rough guide to Covid incidence) or symptoms (a task that gets harder by the day, as Covid continues to present in new and strange ways).  Here's a nice piece that starts with how they deal with malaria incidence, and works through a lot of the problems in translating from test results to meaningful information about Covid.