FORT ST. JOHN, B.C. – There has been another outbreak of a gastrointestinal virus at Site C dam site.B.C. Hydro says 15 works have been affected. Those workers are currently receiving medical treatment and will not return to work until medically cleared. The last reported outbreak happened in January of this year.The Environmental Health Officer for Northern Health has been alerted and Hydro will be contacting First Nations communities and local stakeholders to inform them about the outbreak.- Advertisement -B.C. Hydro has implemented enhanced cleaning in many of the common areas of the work accommodation and at the medical clinic. Employees are also encouraged to increase hand-washing and to report any possible illnesses.The most common way to develop viral gastroenteritis, often called stomach flu, is through contact with an infected person or by ingesting contaminated food or water.