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I wish to thank Dr. M. D. Roadett for his encouragement and continuous advice; Dr. B. G. Hall for his helpful criticism and for the use of laboratory facilities at Alder Hey Hospital; the laboratory staff, in particular the bacteriological department for their patience and technical assistance; Dr. J. D. Abbott for the phage typing; the Paediatricians at Alder Hey Hospital and Olive Mount Children's Hospital for referring cases; and E. B. Squibb and Sons Limited, for a generous grant to enable me to undertake this study.
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M. J. Samuels (1967) studied this question.
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