Flu season means big business for pharmacies, particularly those with clinics staffed with a licensed physician's assistant or a nurse who can give flu vaccines to children. Eric Keuffel, an assistant professor at Temple's Fox School of Business, says providing flu vaccines is a major shot in the arm for pharmacies. "Pharmacies are an increasingly larger share of the vaccination market," he said. "About 12 percent of flu shots were administered via the pharmacy last year as opposed to physician offices, and this year the CDC (Centers for Disease Control) has increased what they call the 'eligible' population to anyone over six months of age."