Forsyth County, NC -- The Forsyth County Department of Public Health says its confirmed a 12th case of the whooping cough in the county since Feb. 18.
That makes 18 cases since the start of 2013.
A spokeswoman said most of the cases were found in students in the Winston-Salem/Forsyth County school district.
School district spokesman Theo Helm confirmed Wednesday that seven students have tested positive for the contagious respiratory infection.
Those students come from four schools, including Sedge Garden Elementary, Flat Rock and Kernersville Middle Schools, and Reagan High School.
Parents of children who came into contact with the students have been notified. The heath department wants them to get an antibiotic treatment.
All the patients are currently being treated for the cough.
WFMY News 2 spoke to Dr. Chris Ohl, professor of medicine, infectious diseases at Wake Forest Baptist Medical Center who said adults who have not received the whooping cough booster shot should get it.
Dr. Ohl also added one of the reasons for seeing more whooping cough cases is that doctors are testing for it more.