ATLANTA (AP) — CDC researchers are being forced to skip a pivotal conference on infectious disease this week due to the government shutdown , missing out on high-level discussions not long after surges in measles and whooping cough hit the U.S. IDWeek, the largest annual meeting of infectious disease experts in the nation, is the leading venue for experts to trade information about diagnosing, treating and preventing threats including bird flu, superbugs and HIV, among many other topics. The