In the Case Report entitled "Ataxia Telangiectasia and Growth Failure" by Juan J. Gershanik, MD, and Vernon James, MD, which appeared in the December issue (Amer J Dis Child122:538-540, 1971), several errors occurred. Reprint requests should be addressed to Dr. Gershanik at his current address, Department of Pediatrics, Lousiana State University, School of Medicine in Shreveport, PO Box 3932, Shreveport, La 71130. The investigation was supported by Public Health Service grant RR-00158. In Table 4, alkaline phosphatase was measured in Bessey-Lowry-Brock (BLB) units and aldolase in Sibley-Lehninger (SL) units. In Table 5, the heading of the third column should read case 2.