"The advice is a timely reminder as cases of both flu and the norovirus (vomiting bug) peak over the winter months."
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Round brackets are used to insert additional information in text. Question: How do we say it, what is being inserted into a bracket, in spoken English? I do mean that when I want to say it. Do I say such as, for example?
The normal thing to do in speech is to treat each of the parenthetical symbols ( and ) as commas, i.e. as slight pauses. However, the example sentence that you supplied would be more idiomatic and more intelligible if the or a was inserted before vomiting bug.