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Discover LudwigThe phrase "a first case of" is correct and usable in written English.
It can be used to indicate the initial occurrence of a particular event, phenomenon, or situation.
Example: "This report highlights a first case of a new strain of the virus in the region."
Alternatives: "an initial instance of" or "the inaugural case of".
Exact(21)
To describe a first case of parasitic twin achieved after intracytoplasmic sperm injection (ICSI).
We report a first case of embolization with a second-generation fully-retrievable and repositionable Lotus valve.
To report a first case of 21-hydroxylase deficiency associated with a new genotype determined by V281+I172N/V281L mutations of the CYP21A2 gene.
A first case of BSE in the United States in 2003 involved a Canadian cow, but the new case is homegrown.
If the signal is real, this observation must be a first case of the detection of non-thermal emission from WDs.
Senegal's health minister has confirmed a first case of Ebola, making it the fifth West African country to be affected by the outbreak.
Similar(39)
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.
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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