The disease is transmittable through the air. Symptoms include fever, coughing, red eyes and skin rash. To optimise the efficiency of the vaccination, the procedure should be done within three to four days after coming in contact with the source of the disease.
Earlier this month, two Cathay Pacific Airways staff members, two baggage handlers and a security guard were infected. Dr Ho pinpointed the outbreak at the airport to people from Asian countries such as Japan and the Philippines who have not been vaccinated yet.
About 400 airport staff have been vaccinated at the station set up by the Centre for Health Protection at the airport.