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The father of a comatose patient alleged that his son's right eye was nibbled by a rat at civic-run Bal Thackeray Trauma Care Hospital in Jogeshwari on April 23. "We saw blood over his eye in the morning. We had seen rats in the general ward earlier, but we didn't witness the incident. He was admitted in the hospital with a blood clot in the brain, following a road accident," the father told ANI.