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.”

A vaccination prevents the hepatitis A liver disease caused by the virus, according to the Centers for Disease Control and Prevention website, cdc.gov. Hepatitis A causes “fatigue, low appetite, stomach pain, nausea, and jaundice,” with symptoms disappearing in about 2 months, officials say on the site.