Stomach Virus

Heres a list of cyclists and stomach virus. What is your take on it? Heres a quote from Cape Epic, "The Bulls came into the day a full 18 minutes down on Cannondale-Vredestein, the team they barely beat to take the overall in 2007. Sahm had suffered a stomach virus through the first four stages of the 2008 race, pushing the German squad squarely into second place." Beware of the stomach virus!!