There is some contention over why the people reacted this way. Some say they ran in fear of catching something while others are saying if you help someone in China you can be held liable and could be sued.
You know those terrible "Flatizzas" Subway makes? After ordering one without the sauce (because "I can't eat that stuff"), Bevalente Michette Hall called the police. She was later jailed for three minutes on a $2,000 bail for her efforts. Here's the 911 call, for those interested: