Hospitalizations for Severe Lower Respiratory Tract Infections

aInfluenza Division, National Center for Immunizations and Respiratory Diseases,

bEpidemic Intelligence Service assigned to the Influenza Division,

aInfluenza Division, National Center for Immunizations and Respiratory Diseases,

aInfluenza Division, National Center for Immunizations and Respiratory Diseases,

cDivision of Environmental Hazards and Health Effects, National Center for Environmental Health,

dDivision for Heart Disease and Stroke Prevention, National Center for Chronic Disease Prevention and Health Promotion, and

eDivision of Birth Defects and Developmental Disabilities, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia

aInfluenza Division, National Center for Immunizations and Respiratory Diseases,

aInfluenza Division, National Center for Immunizations and Respiratory Diseases,