As passengers return to the US from the cruise that saw a rare hantavirus outbreak , much of the country is lacking a basic public health tool: a test to diagnose the illness in the earliest stages of infection. Nebraska may be the first state with the ability to do so. In just a few days, a lab at the University of Nebraska Medical Center in Omaha developed its own diagnostic test for the Andes virus in anticipation of receiving 16 American passengers from the ship. “I believe we might be the only lab in the nation that has this test available at the moment,” Peter Iwen, director of the Nebraska Public Health Laboratory tells WIRED, referring to polymerase chain reaction (PCR) testing, which was important during the Covid-19 pandemic. Its ability to detect tiny quantities of the virus before patients have full-blown symptoms makes it crucial for identifying cases quickly, getting patients prompt medical treatment , and preventing the spread of disease.…