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The sentence isn't correct in Russian either. Диагностируют болезнь, а не пациента.[/quote]

Fair enough, but couldn't его refer to a (masculine) illness? грипп, or рак, for example?

In which...

I maybe wrong, but I'm not sure the English translation is correct... Where is его in the translation? Why is it their diagnosis?.. Maybe his?[/quote]

You're right. The problem is that to express...

диагнозировали is the verb.