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No signs of understanding language. responding to verbal commands or awareness of his surroundings. he has not spoken. this pattern of brain injury, however, is usually seen as result of cardio pulmonary arrest where the blood supply to the brain is inadequate for a period of time resulting in the death of brain tissue. >> dr. gupta is with us. he's a neuro surgeon. as you just heard extensive brain damage shows no current signs of botulism, what do you think could have happened? >> when you talk about the degree of brain damage that he had and it's tough to talk about but it was sort of invol...

Old, it's more likely to be a respiratory arrest. for some reason he wasn't breathing, he wasn't getting enough oxygen into his body, eventually that caused his heart to not pump enough blood to his brain and that's what caused the cell death in his brain. that seems to be what happened but what exactly caused him to stop breathing in the first place to cause that respiratory arrest? we don't know. they're pretty -- they were pretty certain. they were asked about bot ulism. there was no evidence of that even more than a year later, so they just don't know. was it some other toxin? was it an in...