NEW YORK — The second half of the 2010-2011 cough-cold-flu season actually may realize greater sales of symptom relievers than last year, judging from the four weeks ended Dec. 26. According to Matrixx president and CEO Bill Hemelt, sales of remedies were on the rise in those four weeks. Hemelt noted that the total cough-cold category was 5% higher than the same period last year and growing.