Volume 40, no. 7, p. 2642-2644, 2002. Page 2643, column 1: The first sentence of the second full paragraph should be deleted and replaced with the following text. “The NADase activity in culture supernatants was measured as described by Lutticken et al. (15a), with a few modifications (see below). Overnight cultures of GAS were clarified by centrifugation at 2,000 × g for 10 min.”
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15a. Lütticken, R., D. Lütticken, D. R. Johnson, and L. W. Wannamaker. 1976. Application of a new method for detecting streptococcal nicotinamide adenine dinucleotide glycohydrolase to various M types of Streptococcus pyogenes. J. Clin. Microbiol. 3:533-536.