Quebec's public health officials are warning passengers of two Megabus routes between Toronto and Montreal in August that they may have been exposed to tuberculosis.

In a statement issued Wednesday, the Quebec Ministry of Health and Social Services said that a person who was unaware that she had TB made two bus trips between the cities in August.

The ministry obtained records from Coach Canada of passengers of the Megabus route between Montreal and Toronto, via Kingston, and has contacted the majority of them.

However, in its statement the ministry said officials were unable to contact some of the passengers who may have been exposed.

The ministry urged anyone who was on the Megabus at the time to have a TB screening test as soon as possible, even if they exhibit no symptoms of the disease.

Passengers who may be affected took the following routes:

  • Megabus #771 departing from Montreal on Aug. 20, 2015 at 4:30 p.m., stopping in Kingston at 7:25 p.m.
  • Megabus #718 departing from Toronto on Aug. 23, 2015 at 1:30 p.m., stopping in Kingston at 4:10 p.m.

Anyone who was on the buses or at the stations at the same time as the infected passenger can call 811 in Quebec, or 1-844-817-0200 outside of the province, for more information.

Symptoms of TB include coughing that lasts more than three weeks, coughing up blood, chest pain, fatigue, fever, weight loss and chills. It can also lie dormant for years.

The illness can be treated with antibiotics taken over several months.