colonisation
B2CEFR level
45/100Rarity: uncommon
TechnicalRegister
The presence and multiplication of an organism on or in a host without causing clinical infection.
A positive nasal swab may indicate mere colonisation rather than active infection.
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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