Buncombe County in western North Carolina has now reported 11 cases of whooping cough, or pertussis.
The Buncombe County Health and Human Services Department had reported four lab-confirmed cases earlier this week.
Medical Director Dr. Jennifer Mullendore said it's important to work together to keep the community safe from the very contagious infection. Mullendore said it's important to keep immunizations up to date.
She added that those most vulnerable are infants, pregnant women and those with weakened immune systems or pre-existing health conditions.
Symptoms include severe coughing fits, a high-pitched so-called whooping sound when taking a breath or vomiting after coughing fits for at least two weeks.
County health officials say people with pertussis should stay home from school, work and group activities until they have finished five days of antibiotics.