An average of two or three schools have been closed every day due to flu outbreaks in the past two weeks, as the number of flu patients seeking help from private doctors hit a 10-year high. But medical professionals said the number was not surprising given the weather conditions. 'Although Mid-Autumn Festival is near, the weather is like summer,' University of Hong Kong microbiologist Dr Ho Pak-leung said. 'The flu virus has remained very active.' Since September 19, 17 primary, 14 secondary and three special schools have been closed for a week, with more than 1,600 pupils having the flu, at least 92 of them swine flu. Aided Primary School Heads Association honorary chairman Leung Shiu-chuen said class suspensions would definitely affect the teaching pace, but principals had to accept it. He said the Centre for Health Protection could have co-operated better with schools. In one case, officials told a headmaster after pupils had gone for the day that classes were to be suspended. Teachers had to telephone each pupil. 'Because schools are on high alert and classes are suspended promptly, Hong Kong has not seen any children dying of the flu. This is better than other developed countries,' he said. Another swine flu patient, a 30-year-old woman in United Christian Hospital, fell into critical condition yesterday. The woman, who has no underlying condition, developed flu symptoms on September 28 and went to the hospital's emergency room on Wednesday. She is receiving Tamiflu and antibiotics, and needs assistance breathing.