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Discover LudwigThe phrase "cases of flu" is correct and usable in written English.
It can be used when referring to instances or occurrences of influenza illness.
Example: "During the winter months, there are often many cases of flu reported in the community."
Alternatives: "instances of influenza" or "occurrences of flu".
Exact(41)
There were a number of cases of flu.
Could some cases of flu or other diseases be missed?
He was faced with a reported 200 cases of flu and 48 cases of pneumonia.
No deaths have been attributed to any cases of flu in New York this year.
Both zanamivir and oseltamivir are intended for patients with uncomplicated cases of flu.
There were far fewer cases of flu in all age groups.
Similar(19)
Although we selected a period of the year with many cases of flu-like and cold symptoms, we dealt with a highly unbalanced data set, meaning that the dominant class is the NO for the Symptom Presence variable.
The bacteria causes an estimated 2,500 cases of flu-like illness and 500 deaths annually.
Blood was sampled within the first two days of the presentation of signs of infection from 10 healthy volunteers; from 18 cases of flu-like syndrome; and from 31 cases of infection by H1N1 confirmed by reverse RT-PCR.
On the contrary, most of the previous studies took selected cases of flu-like illness only and as a result, the distinction of symptomatology between influenza A infections and upper respiratory tract infections of other pathogens was blurred.
This wasn't a bad case of flu – it was far more serious.
More suggestions(18)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com