Updated from 11:59 a.m. EDTEveryone's talking about the swine flu, whom it might affect, where it is spreading and how to contain it. Swine flu, derived in part from a strain of influenza endemic to pigs, has thus far been detected in humans in Mexico, the U.S., Spain, Canada, New Zealand, Israel and Scotland. According to Mexican health officials, more than 150 people have died in that country as a result of the virus. It is estimated that more than 1,900 people in Mexico have been hospitalized, prompting the government to shut down schools, sports clubs, swimming pools and other public places. Of the 50 or so cases reported in the U.S., most have been mild and none have been fatal.