The government has been urged to consider postponing the Cheung Chau Bun Festival and other large-scale public activities after the first confirmed swine flu case in the city. While medical experts hailed the government's initial reaction as appropriate, they said more needed to be done. Kwok Ka-ki, a medical affairs watcher and former legislator, said the government should have asked residents to avoid non-essential travel overseas. 'The flow of people can easily spread the virus. The confirmed case here showed the flu could be spread to other places easily, without being detected in time,' Dr Kwok said. He described as 'a joke' a suggestion by health minister York Chow Yat-ngok that travellers take travel insurance as a precaution. 'To play it safe, the government should consider postponing large-scale public activities,' Dr Kwok said, citing the Bun Festival to be held on Cheung Chau today. But officials said postponement was not needed, and there would be adequate preventive measures during the Bun Festival. Hong Kong Medical Association president Tse Hung-hing said the government decision not to close schools or postpone public activities was appropriate as there was only one confirmed case. 'We should not push the panic button. There is no need to get the public panicking. What they should do now is to improve personal hygiene. It is as simple as washing their hands more frequently.' Infectious diseases expert Lo Wing-lok agreed. He said it was almost impossible to track down all those who might have contact with the Mexican patient by now. 'The government should tell the public the truth and ask the people to enhance personal hygiene. The government measure to clean up drains does not address the problem because infectious disease is not transmitted through contact with dirty water,' Dr Lo said. Meanwhile, Democrat legislator Cheung Man-kwong, who represents the education sector, urged schools to be prepared for suspension of classes at short notice. In the worst scenario, the O-level public examination should also be postponed, Mr Cheung said. 'Nothing is more important than combating swine flu now,' he said. Some school principals said they would step up preventive measures when classes resumed on Monday. Hong Kong Aided Primary School Head Association chairman Cheung Chi-hung said suspension of classes should not be considered unless there was a full-scale outbreak. 'Course schedules are tight because examinations are coming,' Mr Cheung said. 'For Secondary Five students, their pressure would double if examinations are cancelled.' But Democratic Party legislator Fred Li Wah-ming called for more drastic action: 'The confirmed case shows that border screening measures have failed. We should require all arriving Mexican travellers to undergo medical checks.' Dr Chow said last night that the Mexican patient had not been detected at the border because he had only shown ordinary flu symptoms and had no fever while he arrived in Hong Kong on Thursday.