Is this sentence in active voice or passive voice? Thanks to vaccines, measles has almost been eliminated in many countries.

Understand the Problem
The question asks to identify whether the given sentence, "Thanks to vaccines, measles has almost been eliminated in many countries," is written in the active or passive voice.
Answer
Passive voice
The sentence "Thanks to vaccines, measles has almost been eliminated in many countries" is in the passive voice.
Answer for screen readers
The sentence "Thanks to vaccines, measles has almost been eliminated in many countries" is in the passive voice.
More Information
In passive voice, the subject receives the action rather than performing it. Here, measles (the subject) is being acted upon (eliminated).
Tips
A common mistake is to confuse sentences with a prepositional phrase at the beginning as active voice. Also, passive voice often contains a 'to be' verb.
Sources
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