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What made the 1918 flu epidemic particularly deadly?

1.Most doctors had left their communities to serve in World War I.

2.It struck the very old and the very young, who had weaker immune systems.

3.It traveled with people migrating to Northern cites to work in factories.

4.Scientists had not yet developed ways to effectively treat infections.

Sagot :

Answer:

4.Scientists had not yet developed ways to effectively treat infections.

Explanation:

What causes a a disease to be deadly is when there isn't a vaccine or a way to treat it.

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