Read the sentence to find out if there is any grammatical error or idiomatic error in it. The error, if any, will be in one part of the sentence. Mark that part as the answer. (Ignore errors of punctuation, if any.)
A day after he was diagnosed with / swine flu, preventive measures were put in place / to ensure that others were not / affected by the dreaded virus.
No error
There is no error in this sentence.