Park still thinks it 's a brain infection , but Adams thinks it 's autoimmune .
Adams and Park argue about whether it 's new or old paranoia when Chase interrupts to suggest it may just be a mental illness because all the tests are negative .
Park still thinks Chase 's a illness   , but Adams thinks Chase 's autoimmune .
Adams and Park argue about whether it 's new or old paranoia when Chase interrupts to suggest it may just be a mental illness because all the tests are negative .