The phrase "a pure case of" is correct and usable in written English.
It is typically used to emphasize that a situation or example is a clear or unambiguous instance of something.
Example: "This is a pure case of negligence, as the company failed to follow safety protocols."
Alternatives: "a clear example of" or "a textbook case of".
"This is a pure case of savage capitalism," Raymond Bachand, the Québécois minister of economic development, innovations and exports, told reporters.
"This is a pure case of a guy that can bring the thunder off both sides probably bigger than anybody versus the guy who is the best mover in the game, who's a great mix of defense and offense," Gilbert said.
Maybe it was a pure case of following the money.
Hitler's anti-Semitism seems a purer case of petit-bourgeois paranoia.
H.M. had become a stunningly pure case of anterograde amnesia.
Problematic cases and pure cases of special variants were excluded.
It may, therefore, be useful to systematically distinguish pure cases of either disorder from comorbid cases in future studies to better understand what is characteristic of each disorder.
Note that children with significant language difficulties had been excluded from this group, and they were therefore particularly pure cases of dyslexia.
However, pure cases of vaD without neurodegenerative changes are very rare and autopsy of cases clinically diagnosed as vaD showed that they had pathological signs for AD (Sadowski et al., 2004).
We consider these five female subjects aged 2.3, 2.5, 5.8, 9.6, and 11.3 years as representing "pure" cases of syndrome X. Apparent lack of physical maturation in one of these children is shown in Figure 2.
Notably, pure cases of thiamine deficiency, unaccompanied by chronic and excessive alcohol consumption (such as in cases of malnutrition), show a low rate of progression to KS [ 29], giving credence to the idea that an interaction of causative factors is responsible for the lasting cognitive deficits seen in alcohol-related disorders.
