At the General Hospital in Oaxaca, Mexico, a doctor examined a patient who complained of flulike symptoms on Thursday.Credit...Adriana Zehbrauskas for The New York Times OAXACA, Mexico � Adela María Gutiérrez fell ill in the beginning of April with what she thought was a bad cold. She tried aspirin and antibiotics, bed rest and moist towels, but nothing brought down her soaring fever, reduced her