Bird flu virus shows mutations in first severe human case in US, CDC says

[LeftInTX]

4. The "Hong Kong flu" of 1968-69 was apparently a bird flu. Everyone got it.

No one called it the "H3N2 strain of Influenza A virus" back then. I was only 12 at the time. I caught it on Christmas day, along with my sister. We both got sick at the same time.

https://en.wikipedia.org/wiki/Hong_Kong_flu
There was also: https://en.wikipedia.org/wiki/1957%E2%80%931958_influenza_pandemic

The strain of virus that caused the Asian flu pandemic, influenza A virus subtype H2N2, was a recombination of avian influenza (probably from geese) and human influenza viruses.[9][25] As it was a novel strain of the virus, the population had minimal immunity.[9][18] The reproduction number for the virus was around 1.8 and approximately two-thirds of infected individuals were estimated to have experienced clinical symptoms.[144]