Helminth infestations in immigrant children.

We wish to thank Dr. N. S. Galbraith, of the Epidemiology Reference Laboratory, Colindale, and Dr. G. F. Smith, H.M. Medical Inspector of Factories, South-western Division, for their helpful comments following their investigations of an outbreak at Factory C; Dr. G. T. Cook, Director of the Public Health Laboratory, Guildford, for his help during the initial outbreak at Factory A; Dr. T. D. Blott, Medical Officer of Health, Chelmsford and Maldon U.D.C., for his most helpful co-operation during the investigation of outbreaks at Factory B ; and Miss Barbara Wall, F.I.M.L.T., for technical assistance. Finally, we should like to thank the management, who were always most helpful and co-operative throughout the investigation.