A pigeon trap snaps into action in Shanghai. Pigeons infected with the H7N9 virus were discovered in a food market in the city earlier in the week. The virus has so far killed six people in China - and the government wants to make sure it isn't spreading through the pigeon population. The outbreak has scared many residents. "I'm very worried‚" says this woman. "I have a child. I'm very worried the disease could spread throughout Shanghai." Fears like those have prompted a run on surgical masks and herbal remedies said to stave off the flu. Despite the concerns‚ a leading health official said on Sunday that China could control the outbreak. And the World Health Organization repeated that there is no evidence of transmission from human to human.