The dangerous swine flu virus continues to spread, with infections now confirmed in Israel and New Zealand.The World Health Organization has upgraded its pandemic alert level from 3 to 4 and the organization's deputy director general says that "containment is not a feasible option" at this time.
Seven countries now have confirmed cases, with suspected infections in 11 others. Around the world, countries are nowtightening the borders to prevent infection from travelers. In Mexico, the epicenter of the virus, 153 people have now been killed.
While 50 cases have been confirmed in the United States, the most outside of Mexico, the infections have not been as severe. President Obama described the disease as cause for "alert" rather than "alarm."