How many killed in the Russian flu 1977?

The Russian flu, which occurred in 1977-1978, was caused by the H1N1 influenza virus and primarily affected younger populations. Estimates of the death toll vary, but it is believed that there were between 700,000 to 1 million deaths worldwide. The outbreak was notable for its relatively mild severity compared to other influenza pandemics, particularly affecting those under 25 years old who had little immunity to the virus.