1. Ballard RC (1982) The epidemiology and immunopathology of chlamydial infections in Southern Africa. PhD thesis, University of the Witwatersrand, Johannesburg.
2. Ballard RC, Fehler HG, Piot P (1986) Chlamydial infection in the eye and genital tract in developing societies. In: Oriel JD, Ridgway G, Schachter J, Taylor-Robinson D, Ward M (eds) Chlamydial infections. Cambridge University Press Cambridge p 479–486.
3. Berger RE, Alexander ER, Monda GD, Ansell J et al. (1978) Chlamydia trachomatis as a cause of acute “idiopathic” epididymitis. N Engl J Med 298:301–304.
4. Chapel T, Brown WJ, Jefferies C et al. (1978) The microbiological flora of penile ulcerations. J Infect Dis 137:50–56.
5. Coovadia YM, Kharsany A, Hoosen A (1985) The microbial aetiology of genital ulcers in black men in Durban, South Africa. Genitourin Med 61:266–269.