007490000a22001930004500003000900000005001700009110009300026245014300119562002500262264004900287300000900336041000800345650003800353650004600391650003000437650002900467650002900496610003000525PH-MaWHO20241108112349.0  aWorld Health Organization. Department of Communicable Disease Surveillance and Response.  aInfluenza pandemic preparedness plan : the role of WHO and guidelines for national and regional planning, Geneva, Switzerland, April 1999.  aWHO/CDS/CSR/EDC/99.1  aGeneva : bWorld Health Organization,c1999.  a66p.  aeng  aInfluenzaxPrevention and control  aDisease outbreaksxPrevention and control  aHealthplanning guidelines  aNational health programs  aRegional health planning2 aWorld Health Organization