The Spanish Flu that killed 50 million people between 1918 and 1920 was H1N1. But, I think Bird Flu is H5N1 this time

 

Date	February 1918–April 1920
Virus	H1N1 subtype of the influenza A virus
Number of infected	500 million people, or one-third of the world's population
Number of deaths	17–100 million, with the generally accepted estimate being 25–50 million
Hardest hit groups	Young adults, elderly, and young children
Symptoms	A three-day fever, and cyanosis, a blueish-purple tinge that spread from the extremities
Prevention	Isolation, quarantine, good personal hygiene, and limiting social interaction