 The new strain was first identified by the CDC in two children , neither of whom had been in contact with pigs . The first case , from San Diego County , California , was confirmed from clinical specimens ( nasopharyngeal swab ) examined by the CDC on 14 April 2009 . A second case , from nearby Imperial County , California , was confirmed on 17 April . The patient in the first confirmed case had flu symptoms including fever and cough on clinical examination on 30 March , and the second on 28 March . 
