Universities and other tertiary institutions have suspended classes from today until April 6, following the government's decision to close all schools next week. Community colleges and the continuing education arm of universities have also suspended their classes. But part-time and evening courses at some institutions will run as usual. Offices and facilities at tertiary institutions will remain open. By yesterday, 18 atypical pneumonia cases had been confirmed among students at the Chinese University of Hong Kong (CUHK), of whom 17 are medical students. The majority were being trained at the Prince of Wales Hospital. A spokesman for the university said none of the cases had been infected on its Sha Tin campus, but the university would disinfect all campus facilities, including classrooms, residence halls and restaurants next week. Information about the outbreak has also been posted on a CUHK Web site after the university's intranet was jammed several times yesterday as teachers advised students via e-mail of new deadlines for assignments. 'We may have to reset the exam papers again if the university does not re-open in time for us to cover the whole syllabus,' said Chan King-ming of the Department of Biochemistry. The University of Hong Kong said yesterday one of its non-teaching staff was suspected of being infected and placed under observation at hospital. 'We will inform staff and students should it be confirmed that it is a case of atypical pneumonia,' said Registrar Henry Wai Wing-kuen. The university has no plan to close its residence halls. A university statement said the decision to close was taken in view of student and parental anxiety.