What's the plural form of autoreactivity? Here's the word you're looking for.
Answer
The noun autoreactivity can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be autoreactivity.
However, in more specific contexts, the plural form can also be autoreactivities e.g. in reference to various types of autoreactivities
or a collection of autoreactivities.