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The first cycle of growth in the chick embryo of the agents of trachoma and inclusion blennorrhoea

  • P. Reeve (a1) and Janice Taverne (a1)

Extract

Chick embryos were inoculated with measured doses of various strains of the agents of trachoma and inclusion blennorrhoea, and the number of infective organisms they contained was determined at intervals during the first 4 days after inoculation. From curves of the yield of agent at different times relative to the dose inoculated, it was evident that the lag phase before the exponential phase of growth began was shorter for fast-killing—and more virulent—variant strains than for slow-killing strains, and the difference was statistically significant; and that variant strains multiplied faster during the exponential phase of growth and produced then- highest titres sooner.

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References

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Collier, L. H. (1963). Nomenclature of isolates of virus from trachoma and inclusion blennorrhoea. Nature, Lond. 198, 1229.
Collier, L. H. & Sowa, J. (1958). Isolation of trachoma virus in embryonate eggs. Lancet i, 993.
Gear, J. H. S., Gordon, F. B., Jones, B. R. & Bell, S. D. Jun. (1963). Nomenclature of isolates of virus from trachoma and inclusion blennorrhoea. Nature, Lond. 197, 26.
Jawetz, E. & Hanna, L. (1960). Trachoma viruses isolated in the United States. 2. Assay of egg infectivity and stability. Proc. Soc. exp. Biol. Med. 105, 207.
Jones, B. R. (1961). TRIC virus infections in London. Trans. ophthal. Soc. U.K. 81, 367.
Murray, E. S., Bell, S. D. Jun., Hanna, A. T., Nichols, R. L. & Snyder, J. C. (1960). Studies on trachoma. 1. Isolation and identification of strains of elementary bodies from Saudi Arabia and Egypt. Am. J. trop. Med. Hyg. 9, 116.
Reed, L. J. & Muench, H. (1938). A simple method of estimating fifty percent endpoints. Am. J. Hyg. 27, 493.
Reeve, P. & Taverne, J. (1963). Observations on the growth of trachoma and inclusion blennorrhoea viruses in embryonate eggs. J. Hyg., Camb. 61, 67.
T'ang, F. F., Chang, H. L., Huang, Y. T. & Wang, K. C. (1957). Studies on the etiology of trachoma with special reference to the isolation of the virus in chick embryos. Chin. med. J. 75, 49.
Taverne, J., Blyth, W. A. & Reeve, P. (1964). Growth in the chick embryo of strains of trachoma and inclusion blennorrhoea virus of differing virulence. J. gen. Microbiol. 37, 277.

The first cycle of growth in the chick embryo of the agents of trachoma and inclusion blennorrhoea

  • P. Reeve (a1) and Janice Taverne (a1)

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