Another Chinese student from Boston University, Zhou Danling, was also injured in the bombing but was in stable condition after being treated at the Boston Medical Center, state media said on Wednesday.

WSJ: China Mourns Boston Marathon Victim

The teenager is in a stable condition in hospital after he was shot in Great George Square, in the city's Chinatown, at about 21:30 BST on Friday.

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In this form of the disease, the condition remains stable and often doesn't progress to serious forms of MS after the initial attack.

CNN: Multiple sclerosis

The two wounded firefighters were in stable condition after surgery Tuesday, Pickering said Tuesday morning.

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His mother said after three days in intensive care his condition is stable but the next few days will be crucial to see if he responds to treatment.

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Beck said one woman was in stable condition with two gunshot wounds and the other was being released after treatment.

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