"There are immune factors that are giving children some sort of defense, that is the only explanation we have," he said.
Another factor may be that some Mexican patients may have delayed seeking medical help too long, Cordova said.
SHOOT: This is shocking - there was a 3 fold increase in flu diagnosis in Mexico in late March and the present month, and Mexican mis-diagnosed this as a late rebound of ordinary flu. A 3 fold increase that has had a month to germinate in Mexico.
US citizens are surviving because the infected, so far, have all been children. Young adults with a more sophisticated immunity (and thus more antibodies) have not experienced the virus on home soil.