Before 1918, a lot of the flu pandemics were of equine origin, now thought to be extinct. The 1918 was avian and people did not have any prior immunity. All pan

Before 1918, a lot of the flu pandemics were of equine origin, now thought to be extinct. The 1918 was avian and people did not have any prior immunity. All pandemics since have been a mutant of the 1918. A universal vaccine will be great since we don't know when something like bat flu will become a problem. Compared to the exponential growth of say ecoli bacteria, any of the current egg solutions are vastly inferior for production speed and expense. This is especially important for poorer countries, aid, and health initiatives. The secondary infection I am talking about was due to common respiratory flora. See: http://www.nih.gov/news/health/aug2008/niaid-19.htm http://www.nih.gov/news/health/aug2008/niaid-19.htm or from wiki: "One of the most striking of the complications was hemorrhage from mucous membranes, especially from the nose, stomach, and intestine. Bleeding from the ears and petechial hemorrhages in the skin also occurred."[30] The majority of deaths were from bacterial pneumonia, a secondary infection caused by influenza, but the virus also killed people directly, causing massive hemorrhages and edema in the lung.