The Louisiana Office of Public Health conducted a case-control study of emergency department visits in New
Orleans in the aftermath of Hurricane Katrina. The OPH distributed a questionnaire to patients seeking treatment for cough, sinus drip, sneezing, wheezing, chest congestion, swollen red and puffy eye(s) and sore throat. According to the study, state epidemiologists found no increase in the rate of New Orleans-area respiratory illnesses. Although rates were found to be no different in comparison to state and country rates, the study showed that people with chronic sinus or respiratory symptoms were more affected by the hurricane.
State epidemiologist Dr. Raoult Ratard disputed the existence of any disease cluster associated with the hurricane in 2006: "There is no such thing as a single condition such as ‘Katrina Cough’ that would be different from the bacterial and viral respiratory conditions we would expect to see at that time of year...no such outbreak occurred because of Hurricane Katrina."[2]