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.
According to the Centers for Disease Control and Prevention, people with the flu can transmit the virus a day before they even begin to show symptoms. They will continue to be contagious for about five to seven days after they develop the symptoms. According to Flu.gov, children and people with compromised immune systems may be contagious for a longer period.