A pupil from Hautlieu School was today being treated for the virus and was believed to be recovering well.
The case comes just days after pupils at Les Quennevais School, Beaulieu School and St George’s Preparatory School were struck down by the disease.
All the patients and their close contacts have been treated with the anti-viral drug Tamiflu, and Health department representatives have visited the affected schools to give advice on how to limit the spread of the disease.
Dr Rosemary Geller, Jersey’s Medical Officer of Health, said that the department’s policy of trying to contain the disease, rather than treat patients on a case-by-case basis, was helping to limit the spread of the flu.
A flu helpline, which offers general information about the disease, is available on 445566 from Monday to Friday between 8.30 am and 5.30 pm.