Update: influenza activity--United States and worldwide, May 20-September 15, 2007. MMWR. Morbidity and mortality weekly report [MMWR Morb Mortal Wkly Rep] Journal article

During May 20-September 15, 2007, influenza A (H1), influenza A (H3), and influenza B viruses cocirculated worldwide and were identified sporadically in the United States. This report summarizes influenza activity in the United States and worldwide since the last MMWR update.

MMWR. Morbidity and mortality weekly report [MMWR Morb Mortal Wkly Rep]