gmatbusters wrote:
My confusion is with what is 'which' modifying here, or what is it that "caused only a mild illness": - did cowpox cause a mild illness, or is it when experimental subjects were deliberately infected caused a mild illness?
You make a valid point here. The phrasing in the original question is not very precise. Something like this would be clearer:
"if experimental subjects were given a cowpox injection, which caused only a mild illness . . . ."
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