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(CNN)Late one night in April 2013, UK veterinarian Jonathan Cranston woke in agony. There was a sharp pain shooting through his chest.
"I felt like I'd been stabbed," he said. The pain soon passed, however, and he went back to sleep. "I didn't think much of it."
But that would not be the end of his ordeal.
In the weeks that followed, the stabbing pain didn't return, but it was replaced with night sweats, shortness of breath, coughing and weight loss. "I started deteriorating quite quickly," he said.