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.
How long are you contagious with the flu for? The influenza virus, also known as the common flu, is a highly contagious respiratory virus that affects all age groups. The virus has a different effect on every person, and symptoms can range from mild to life-threatening.