WHO Technical Consultation on the Severity of Disease Caused by the new influenza A (H1N1) virus infections
Revised full report posted 9 May 2009 (short summary originally posted 6 May 2009)
On 5 May 2009 WHO convened a technical consultation via teleconference to assess current knowledge about the severity of disease caused by influenza A(H1N1) infection and the implications this might have near the start of a pandemic. WHO also sought data on the clinical spectrum and patterns of the disease and how this compares with what is seen during epidemics of seasonal influenza.
Information was provided by epidemiologists, clinicians, and virologists from Canada, Mexico, Spain, the United Kingdom, and the United States of America. These countries have the largest experience, to date, in aggressive surveillance for the disease and the detection and investigation of cases. In addition, international experts advised WHO during the consultation.
This report includes data provided by each country followed by a brief summary of the key points and considerations for interpretation. The information should be considered preliminary as the situation is evolving and investigations are ongoing.