What's the plural form of influenza? Here's the word you're looking for.
Answer
The noun influenza can be countable or uncountable.
In more general, commonly used, contexts, the plural form will be influenzas.
However, in more specific contexts, the plural form can also be influenze e.g. in reference to various types of influenze
or a collection of influenze.
Under such a situation, physicians will want to only prescribe such therapies to patients infected with the lethal virus, as opposed to the seasonal influenzas.