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—In the article entitled "Acquired Immunodeficiency Syndrome" that appeared in the July 1991 issue of the Archives (1991;48:695-699), an error appeared in the definition of the term ID50. The term was defined on page 695, column 2, lines 23 and 24, as follows: "... (median infective dose that will produce infection in 50% of test subjects) of HIV." The term should have been defined as follows: "... (median inhibitory dose that will inhibit 50% of test isolates) of HIV."
Incorrect Definition. Arch Neurol. 1991;48(12):1238. doi:10.1001/archneur.1991.00530240042015
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