How To Use Active immunity In A Sentence

• Variations in chemiotaxis towards different organisms probably depend in natural conditions, as well as in active immunity, upon the opsonic content of the serum. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy"
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• BLITZER: That's what they call retroactive immunity, if you like. CNN Transcript Oct 16, 2007
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