Question

What started the Spanish flu?

Answer 1

Answer:

It was caused by an H1N1 virus with genes of avian origin. Meaning, it came/spread from birds such as North American and wild.

Explanation:

Answer 2

Even though it’s called the Spanish flu it’s didn’t originate there, 1918 flu pandemic, was an unusually deadly influenza pandemic caused by the H1N1 influenza