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Abstract
Introduction / objectives
In the 2009 H1N1 pandemic, the Hospital Authority managing >90% of hospital beds and
74 outpatient clinics in Hong Kong implemented mandatory reporting for healthcare
workers (HCWs) with confirmed pH1N1 and collected detailed data on infected HCWs.
Methods
Under mandatory reporting, HCWs with influenza-like illness must present themselves
to staff clinic and tested for pH1N1 by RT-PCR and viral culture. A confirmed case
was defined as positive on either test. A standard questionnaire was used to assess
clinical presentation and nature of exposure. Clinical staff were defined as HCWs
involved in direct patient care and non-clinical staff are those without. The reporting
for all staff began on 17 June until 31 August 2009. From 1 September 2009, it was
mandatory only for clinical staff until 31 May 2010 when the pandemic was downgraded
Infection control guidelines were issued on 29 April 2009 and education sessions were
attended by >39,000 staff.
Results
During staff mandatory reporting, there were 249 confirmed pH1N1 cases among 40,511
clinical staff (0.62%) and 119 among 18,759 non-clinical staff (0.63%; p=0.82). The
relative risk for clinical versus non-clinical staff was 0.98 (95% CI, 0.78-1.20).
In the entire reporting period, a total of 1039 (2.6%) clinical staff had pH1N1 infection.
Among clinical staff, 212/1039 (20%) cases reported contact with a confirmed pH1N1
infection, similar to the 24/119 (20%) from non-clinical staff. Importantly, unprotected
exposure to a colleague confirmed with pH1N1 were 10-fold higher than exposure to
infected patients, similar for clinical (9%) and non-clinical (8.4%) staff (p = 0.97).
Conclusion
Attack rate was similar for clinical and non-clinical staff showing no increased risk
in clinical care.
Disclosure of interest
P. Ching: None declared, C. Lam: None declared, B. Cowling Grant/Research support
from MedImmune Inc., W. H. Seto Other Presented in anti infective meeting 2010 by
Pfizer.
This is an open access article distributed under the terms of the Creative Commons
Attribution License (
http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided
the original work is properly cited.
Conference name:
International Conference on Prevention & Infection Control (ICPIC 2011)