Corrected entry: Caesar the Chimpanzee spoke human words. However Great Apes' vocal chords make them unsuitable for speech as they are higher in their throats. Since the virus only affects the brain and doesn't physically change the location of the apes' vocal chords, it's impossible for Caesar to speak, no matter how smart he is.
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Correction: Caesar spoke after he was exposed to the updated ALZ-113 drug. It is shown that this drug causes a physical side effect in humans when we see the exposed doctor sneezes blood, though no specifics were stated. Since this drug causes physical changes in humans, it is not unlikely that it could also cause a physical change in apes as well, allowing Caesar and other exposed apes to speak.
jshy7979
The exposed doctor has disease symptoms. That's not the same as changing the location of the vocal chords.
lionhead