Abstract
Fifteen strains of chlamydial agents, 2 Chlamydia trachomatis and 13 Chlamydia psittaci, were tested for plaque formation on chick embryo fibroblast cells. C. trachomatis strains did not form plaques; 12 strains of C. psittaci did form plaques and 1 strain did not. The distribution of plaque sizes with C. psittaci strains was studied and it was found that the 12 strains could be tentatively grouped into three plaquing types: small (<0.50 mm), intermediate (0.50 to 0.90 mm), and large (>0.90 mm). Small plaques were predominantly associated with strains M56, ET, CP3, CT4, EBA, CS1, and CT2. Intermediate size plaques were predominantly associated with strains NJ1, VT1, and H81. Large plaques were predominantly associated with strains WC and OG. Plaque size appears to be related to virulence of Chlamydia for laboratory animals.
Full text
PDF
Images in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- GRAYSTON J. T., WANG S. P., WOOLRIDGE R. L., YANG Y. F., JOHNSTON P. B. Trachoma-studies of etiology, laboratory diagnosis, and prevention. J Am Med Assoc. 1960 Apr 9;172:1577–1586. doi: 10.1001/jama.1960.03020150001001. [DOI] [PubMed] [Google Scholar]
- HIGASHI N., TAMURA A. A plaque assay for meningopneumonitis virus in monolayers of strain L cells. Virology. 1960 Dec;12:578–588. doi: 10.1016/0042-6822(60)90180-x. [DOI] [PubMed] [Google Scholar]
- KOZIKOWSKI E. H., HAHON N. PLAQUE FORMATION BY PSITTACOSIS VIRUS. J Bacteriol. 1964 Aug;88:533–534. doi: 10.1128/jb.88.2.533-534.1964. [DOI] [PMC free article] [PubMed] [Google Scholar]
- PIRAINO F., ABEL C. PLAQUE ASSAY FOR PSITTACOSIS VIRUS IN MONOLAYERS OF CHICK EMBRYO FIBROBLASTS. J Bacteriol. 1964 Jun;87:1503–1511. doi: 10.1128/jb.87.6.1503-1511.1964. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Page L. A. Interspecies transfer of psittacosis-LGV-trachoma agents: pathogenicity of two avian and two mammalian strains for eight species of birds and mammals. Am J Vet Res. 1966 Mar;27(117):397–407. [PubMed] [Google Scholar]
- Schloer G. M., Hanson R. P. Relationship of plaque size and virulence for chickens of 14 representative Newcastle disease virus strains. J Virol. 1968 Jan;2(1):40–47. doi: 10.1128/jvi.2.1.40-47.1968. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Storz J. Psittacosis-lymphogranuloma infection of sheep. Antigenic structures and interrelations of PL agents associated with polyarthritis, enzootic abortion, intrauterine and latent intestinal infections. J Comp Pathol. 1966 Oct;76(4):351–362. doi: 10.1016/0021-9975(66)90055-7. [DOI] [PubMed] [Google Scholar]