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The phrase "a sixth case of" is correct and usable in written English.
It can be used when referring to the occurrence of a specific event or situation for the sixth time.
Example: "The health department reported a sixth case of the flu in the community this week."
Alternatives: "the sixth instance of" or "the sixth occurrence of".
Exact(2)
Veterinary authorities confirmed a sixth case of mad cow disease, in Rimavska Seca.
The immunization campaign comes shortly after the country's health authorities reported a sixth case of the polio virus in the south of the country this year.
Similar(58)
As recently as a decade ago, researchers could spend years trying to find a second case of a newly discovered disease.
"And I said, 'All right, we'll get more.' " As recently as a decade ago, researchers could spend years trying to find a second case of a newly discovered disease.
A second case of aggravated deception is under investigation.
But a third case of Republican leftward movement has just manifested itself.
A second case of polio was confirmed in Indonesia and more are expected, the Health Ministry said.
To describe a first case of parasitic twin achieved after intracytoplasmic sperm injection (ICSI).
A second case of bejewelled bows illustrate the mode for bodice ornaments in the 17th century.
A second case of an infected cow was discovered last week and wholesale prices for beef have dropped by 20percentt.
We report a first case of embolization with a second-generation fully-retrievable and repositionable Lotus valve.
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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