opportunistic infection
B2CEFR level
65/100Rarity: rare
TechnicalRegister
An infection caused by an organism that rarely harms people with intact immunity but exploits immunocompromise.
Pneumocystis pneumonia is a classic opportunistic infection in advanced HIV.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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