Cats have been found to carry a virus that causes acute depression in humans.

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In total of 51 patients with acute depression took part in the study.

BBC: Scan predicts path of depression

After the shootings at Virginia Tech that left 32 students dead in April 2007, Jones, a clinical psychologist, was one of the counselors who went into classes to discuss the symptoms of depression, acute stress disorder and PTSD.

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It wasn't long after that that his bouts with depression became more acute.

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