2009 H1N1 influenza infection in Korean healthcare personnel

Abstract

Healthcare personnel (HCP) can acquire influenza and transmit it to patients and other hospital staff. The aim of this study was to evaluate the attack rate of HCP by the 2009 H1N1 influenza virus during the 2009 pandemic influenza season in Korea. HCP infected with H1N1 virus were asked to fill out a questionnaire, which included job type, method of diagnosis, facility type, history of contact with patients infected by H1N1 virus, vaccination status, and use of personal protective equipment. A total of 328 HCP (female 68.6%, 225/328) were infected with H1N1 virus at the nine study centers. The highest attack rate was in physicians, followed by nurses and nurses' aides. Transmission occurred primarily after contact with outpatients (27.8%), followed by contact with inpatients (21.6%). Most (77.3%) of the infected HCP never used an N95 mask during contact with patients. Surgical masks were always used by 29.4% of the subjects and usually or intermittent used by 46.9%. The peak incidence of the H1N1 infection among HCP preceded that among the general population. Among HCPs, physicians, nurses, and nurses' aides were at the greatest risk of H1N1 infection. HCP should be more vigilant and protect themselves with appropriate personal protective equipment during the influenza season.

Fig. 1

The number of infected healthcare personnel with influenza A (H1N1) 2009 virus at nine university-affiliated hospitals and daily antiviral agent consumption from September to December 2009 in Korea. H1N1 vaccinations were started for healthcare personnel on 27th October 2009 (arrow 1), students in elementary, middle, and high schools on 11th November 2009 (arrow 2), young children under 6 years of age on 7th December 2009 (arrow 3), and pregnant women on 21st December 2009 (arrow 4)