Swine flu fears evident as world’s cases top 6,000

Ng Han Guan/AP

Passengers wearing protective mask, wait to transit to Tokyo as a bus depart with passengers arriving on a flight from Chengdu at the Beijing airport, China, Wednesday, May 13 , 2009. Health officials Wednesday confirmed mainland China’s second swine flu case in a week _ a student who recently returned from Canada _ and stepped up screening for domestic travelers to head off an outbreak within the country.