By all accounts, it’s been a very busy first half of the season for cough-cold manufacturers, even though the 52-week comparable period is only showing a 1.9% lift in overall sales across food, drug and mass (minus Walmart) for the period ended Jan. 24, according to Information Resources Inc. data. For the 2009-2010 season, the weekly percentage of outpatient visits for influenza-like illness peaked at the end of October 2009 at 7.7%, the Centers for Disease Control and Prevention reported. That peak was higher than the three previous influenza seasons as reported by the U.S. Outpatient ILI Surveillance Network.