Are you asking what it is?
The influenza was a strain that people had no immunity.
Answer:
missionaries
Explanation:
I don't have the list but this is the closest answer I know
Answer: caballus
Explanation: caballus, were brought back to North America, first in the Virgin Islands, and, in 1519, they were reintroduced on the continent, in modern-day Mexico, from where they radiated throughout the American Great Plains, after escape from their owners or by pilfering (Fazio 1995).