Mexican health officials said Wednesday that testing of backlogged cases has increased the confirmed swine-flu death toll from 31 to 42, including three new deaths in the past two days. Officials also have confirmed nearly 1,100 cases of flu infection. Health Secretary Jose Cordova said most of the new confirmations came from older cases. The updates came as Mexico ended a five-day government-ordered shutdown designed to contain the virus. Earlier Wednesday, an airplane full of Mexicans who were quarantined at hospitals and hotels in China despite showing no symptoms of swine flu arrived home. Mexican first lady Margarita Zavala and foreign ministry officials greeted the passengers as they exited a government-chartered jet at Mexico City's international airport. Authorities did not say exactly how many were on the flight but estimated the number at about 140.