Bradford, W.L. : Pertussis. In Textbook of Pediatrics, W.E.Nelson et al., eds. 9th Ed. Philadelphia, W. B. Saunders Company, 1969, p. 568.
2.
Brooksaler, F. and Nelson, J.D.: Pertussis; reappraisal and report of 190 confirmed cases. Amer. J. Dis. Child.114: 389, 1967 .
3.
Gellis, S.S. : The Yearbook ofPediatrics1969. Chicago, Yearbook Medical Publishers, 1969, p. 69.
4.
Haggerty, R.J. : Preventive pediatrics. In Textbook of Pediatrics, W. E. Nelson et al., eds. 9th Ed. Philadelphia, W. B.Saunders Company, 1969, p. 189.
5.
Immunization Against Disease, 1966-67. Atlanta, National Communicable Disease Center, 1967, p. 14.
6.
Ibid., p. 21.
7.
Immunization against whooping-cough. Brit. Med. J. 4: 316, 1969.
8.
Public Health Laboratory Service Whooping-Cough Committee and Working Party: Efficacy of whooping-cough vaccines used in the United Kingdom before 1968. Ibid. 4: 329, 1969.
9.
Public Health Service Advisory Committee on Immunization Practices: Diphtheria and tetanus toxoids and pertussis vaccine. Morbidity and Mortality Weekly Report Supplement, October 25,1969, p. 4.
10.
Shaper, A.A. and Polk, L.D.: Smallpox vaccination ; when and whether . Clin. Pediat.8: 18A, September 1969.
11.
11. Smith, M.: Immunization; the current scene. Hosp. Pract. 4: 42, November 1969.
