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When a bacteria | virus
 virus
comp., MS Virus
or other microorganism mutates and becomes insensitive to a drug that was previously | effective
 effective
comp., MS efficace
Drug resistance can be a cause of HIV treatment failure
- only individual words found (there may be no translations for some thesaurus entries in the bilingual dictionary)

to phrases
 English thesaurus
WHEN [wen] abbr.
abbr., ed. World Home Education Network
abbr., med. Women's Health and Environmental Network
When a: 1 phrase in 1 subject
Microsoft1