The infected pupil has contracted the flu from pupils of another high school, Ngo Thoi Nhiem, where 65 pupils and teachers have already caught the disease, said Dr Nguyen Van Chau, Director of the Municipal Health Department.

The department has ordered the Nguyen Khuyen school to set up a field hospital, the second of its kind in the southern hub, to quarantine and treat the infected pupils and give medical check-ups to other pupils.