Twenty boys and 14 girls aged four to 17 are infected with parainfluenza at the Caritas Medical Centre Developmental Disability Unit. The Centre for Health Protection said they are in stable condition and are being cohorted in a paediatrics ward. Four have fever.

Contact tracing on over 300 healthcare workers, their home contacts, visitors and patients discharged from the paediatrics wards found six reported fever and respiratory symptoms. Two are healthcare workers who have now recovered, and four are discharged patients from the paediatrics ward. The latter have been admitted to Princess Margaret Hospital's isolation wards in a stable condition.

Laboratory tests for three of discharged patients showed adenovirus in 2 and parainfluenza type 3 in one. Adenovirus and parainfluenza virus are common viruses in the community.

The Centre for Health Protection and the Hospital Authority are monitoring the situation and the effective implementation of infection control measures. The centre will liaise with the Caritas Medical Centre weekly to discuss any unusual signs of infection to provide timely advice on infection control.

Tests on parainfluenza virus in more clinical specimens are continuing.