LETTER TO THE EDITOR

1Evidence-based medicine working group. Evidence-based medicine: a new approach to teaching the practice of medicine. JAMA 1992; 269:2420-5.

2 Fine A Lessons from the West Nile viral encephalitis outbreak in New York city Layton M. , 1999: implications for bioterrorism preparedness. Clin Infect Dis 2001; 32:277-82.

3Anonymous. Solid response to SARS - almost. Nat Med 2003; 9:479.