Sorry, John Denver.

American Airlines alerted passengers on a recent flight from San Francisco to Charlotte of possible hepatitis A exposure, a spokeswoman for the Mecklenburg County Health Department confirmed Saturday.

County health officials spoke by phone with all 18 passengers from the Charlotte area who were aboard the Sept. 21 flight, and all have since been vaccinated against the virus, health department spokeswoman Rebecca Carter told The Charlotte Observer.

“The risk was only to the passengers on the flight,” Carter said, explaining why health officials didn’t issue a general county alert. “There was no risk to the public.”