Pierce County, Washington. Pierce County is a county in the U.S. state of Washington. As of the 2010 Census, the population was 795,225, making it the second-most populous county in Washington behind King County. The county seat and largest city is Tacoma.
You can be contagious from a few days up to two weeks or more, depending on which virus is causing your stomach flu (gastroenteritis). A number of viruses can cause gastroenteritis, including noroviruses and rotaviruses.
An adult infected with influenza may be contagious from one day before symptoms start to 5 to 7 days after becoming sick. Children may continue to be contagious for longer than 7 days. Staying home until your contagious period has likely passed will help you avoid passing the flu on to other people.