Yosemite workers will be studied for disease clues

SAN FRANCISCO (Reuters) – Public health officials plan to interview and collect blood samples from up to 2,500 Yosemite National Park workers as they hunt for clues in the biggest outbreak of the deadly hantavirus in nearly two decades, a state health official said on Monday. The voluntary employee screening, scheduled for Tuesday and Wednesday, is the most recent effort to shed light on the rare, mouse-borne lung disease, which infected nine park visitors and killed three last summer. …