National Institutes of Health | 19 August 2008
Bacterial-Pneumonia-Caused-Most-Deaths-in-1918-Influenza-Pandemic-August-19-2008-News-Release-National-Institutes-of-Health-NIHNational Institutes of Health | 19 August 2008
Bacterial-Pneumonia-Caused-Most-Deaths-in-1918-Influenza-Pandemic-August-19-2008-News-Release-National-Institutes-of-Health-NIH