is transmitted ?

[Biro]

"A disease is transmitted to animals." How do we call the word "transmitted", is it a past participle ?

[Our Tort System]

Yes, it is.
The sentence is written in passive voice, and it requires the past participle of the main verb, as far as I'm concerned.

By the way, a common mistake: what do we call bla bla bla... is the correct version.
=)
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