Syndromic surveillance during pandemic (H1N1) 2009 outbreak, New York, New York, USA

Abstract

We compared emergency department and ambulatory care syndromic surveillance systems during the pandemic (H1N1) 2009 outbreak in New York City. Emergency departments likely experienced increases in infl uenzalike- illness signifi cantly earlier than ambulatory care facilities because more patients sought care at emergency departments, differences in case defi nitions existed, or a combination thereof.