INTRODUCTIONThis paper describes the epidemiology and control of a community outbreak of novel influenza A (H1N1-2009) originating from a dance club in Singapore between June and July 2009.

MATERIALS AND METHODSCases of novel influenza A (H1N1-2009) were confirmed using in-house probe-based real-time polymerase chain reaction (PCR). Contact tracing teams from the Singapore Ministry of Health obtained epidemiological information from all cases via telephone.

RESULTSA total of 48 cases were identified in this outbreak, of which 36 (75%) cases were patrons and dance club staff, and 12 (25%) cases were household members and social contacts. Mathematical modelling showed that this outbreak had a reproductive number of 1.9 to 2.1, which was similar to values calculated from outbreaks in naïve populations in other countries.

CONCLUSIONThis transmission risk occurred within an enclosed space with patrons engaged in intimate social activities, suggesting that dance clubs are places conducive for the spread of the virus.

Adolescent ; Adult ; Commerce ; Contact Tracing ; methods ; Dancing ; Disease Outbreaks ; Female ; Humans ; Influenza A Virus, H1N1 Subtype ; isolation & purification ; Influenza, Human ; diagnosis ; epidemiology ; Interviews as Topic ; Male ; Models, Statistical ; Polymerase Chain Reaction ; Singapore ; epidemiology ; Travel ; Young Adult

The effectiveness of a dental curriculum as reflected by the competencies of the graduates is paramount in ensuring its relevance in the rapidly evolving field of dentistry. This work aimed to assess the competencies of dental graduates of the Faculty of Dentistry, Universiti Kebangsaan Malaysia (UKM) as perceived by the graduates and their employers on the basis of the core competencies listed in the undergraduate dental curriculum. A self-administered questionnaire consisting of 43 questions based on eight competency domains were sent to all UKM dental graduates of years 2012 to 2015 and to senior dental officers who represented their employers. The eight domains assessed were as follows: 1) gathering information at chair-side, 2) diagnosis, 3) treatment planning, 4) treatment and prevention, 5) communitybased, 6) management and administrative, 7) communication and 8) personal management and professional development. a total of 132 graduates (75%) and 18 employers (55%) responded. Only domain E on community-based skills was collectively rated ‘satisfactory’ while the rest of the seven domains had an ‘excellent’ rating by all respondents. With regard to individual skill, basic life support was rated very low for both groups (38.6% graduates and 23.5% employers). A strong association was found between the scores given by the graduates and their employers (p= 0.00). Generally, no difference was found between the scores of graduates from different years. The findings allow an evaluation of the curriculum in a myriad of angles. Although the graduates reported a good level of competency in most domains, the employers were reserved on the community-based skills. Poor competency in the key skill of basic life support in medical emergencies was highlighted and must be addressed in the curriculum or during training at the workplace.

INTRODUCTION: Chest radiographs (CXRs) are widely used for the screening and management of COVID-19. This article describes the radiographic features of COVID-19 based on an initial national cohort of patients. METHODS: This is a retrospective review of swab-positive patients with COVID-19 who were admitted to four different hospitals in Singapore between 22 January and 9 March 2020. Initial and follow-up CXRs were reviewed by three experienced radiologists to identify the predominant pattern and distribution of lung parenchymal abnormalities. RESULTS: In total, 347 CXRs of 96 patients were reviewed. Initial CXRs were abnormal in 41 (42.7%) out of 96 patients. The mean time from onset of symptoms to CXR abnormality was 5.3 ± 4.7 days. The predominant pattern of lung abnormality was ground-glass opacity on initial CXRs (51.2%) and consolidation on follow-up CXRs (51.0%). Multifocal bilateral abnormalities in mixed central and peripheral distribution were observed in 63.4% and 59.2% of abnormal initial and follow-up CXRs, respectively. The lower zones were involved in 90.2% of initial CXRs and 93.9% of follow-up CXRs. CONCLUSION In a cohort of swab-positive patients, including those identified from contact tracing, we found a lower incidence of CXR abnormalities than was previously reported. The most common pattern was ground-glass opacity or consolidation, but mixed central and peripheral involvement was more common than peripheral involvement alone.
COVID-19 ; Humans ; Lung/diagnostic imaging* ; Radiography, Thoracic ; Retrospective Studies ; SARS-CoV-2 ; Singapore