A lab worker injecting chicken eggs with Hong Kong flu virus, via The Center for Disease Control and Prevention (CDC)
The 1968 Hong Kong flu was even milder than the Asian Flu from a decade before. This virus only killed 33,800 Americans according to Pandemicflu.gov
, less than the seasonal flu killed last year. The Hong Kong Flu evolved from the Asian Flu, leaving anyone who contracted the 1957 virus with significant immunity to the 1968 version.