Abstract
When virulent Legionella pneumophila is passaged on supplemented Mueller-Hinton agar, it remains virulent for guinea pigs and embryonated hen eggs for two passages. However, by the fifth passage the cultures become avirulent for guinea pigs. Flagella were not produced by L. pneumophila on the first passage on supplemented Mueller-Hinton agar. In contrast, 12 passages on charcoal-yeast extract agar did not result in the reduction of virulence or the loss of flagella of L. pneumophila. Growth in supplemented yeast extract broth or on Norit-A-filtered supplemented yeast extract agar also did not result in a reduction of the virulence of L. pneumophila. However, L. pneumophila did not produce flagella when grown on these two media. Thus, it appears that the production of flagella is not required for the virulence of L. pneumophila when administered by the intraperitoneal route of infection. A virulent flagellated form of L. pneumophila was recovered by passing an avirulent form six times in guinea pigs. When avirulent L. pneumophila was passaged 12 times in embryonated eggs, a nonflagellated form of the bacterium was recovered which had an increased virulence for guinea pigs and embryonated eggs. However, virulent forms were not recovered by passage of avirulent forms on commonly used laboratory media. These results support the suggestion that a suitable host is required for the selection of the virulent form of L. pneumophila from avirulent cultures.
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- Bopp C. A., Sumner J. W., Morris G. K., Wells J. G. Isolation of Legionella spp. from environmental water samples by low-pH treatment and use of a selective medium. J Clin Microbiol. 1981 Apr;13(4):714–719. doi: 10.1128/jcm.13.4.714-719.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Chandler F. W., Thomason B. M., Hébert G. A. Flagella on Legionnaires' disease bacteria in the human lung. Ann Intern Med. 1980 Nov;93(5):715–716. doi: 10.7326/0003-4819-93-5-715. [DOI] [PubMed] [Google Scholar]
- Elliott J. A., Johnson W. Immunological and biochemical relationships among flagella isolated from Legionella pneumophila serogroups 1, 2, and 3. Infect Immun. 1981 Aug;33(2):602–610. doi: 10.1128/iai.33.2.602-610.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Feeley J. C., Gibson R. J., Gorman G. W., Langford N. C., Rasheed J. K., Mackel D. C., Baine W. B. Charcoal-yeast extract agar: primary isolation medium for Legionella pneumophila. J Clin Microbiol. 1979 Oct;10(4):437–441. doi: 10.1128/jcm.10.4.437-441.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Feeley J. C., Gorman G. W., Weaver R. E., Mackel D. C., Smith H. W. Primary isolation media for Legionnaires disease bacterium. J Clin Microbiol. 1978 Sep;8(3):320–325. doi: 10.1128/jcm.8.3.320-325.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hébert G. A. Room temperature storage of Legionella cultures. J Clin Microbiol. 1980 Dec;12(6):807–809. doi: 10.1128/jcm.12.6.807-809.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
- McDade J. E., Shepard C. C. Virulent to avirulent conversion of Legionnaires' disease bacterium (Legionella pneumophila)--its effect on isolation techniques. J Infect Dis. 1979 Jun;139(6):707–711. doi: 10.1093/infdis/139.6.707. [DOI] [PubMed] [Google Scholar]
- Pine L., George J. R., Reeves M. W., Harrell W. K. Development of a chemically defined liquid medium for growth of Legionella pneumophila. J Clin Microbiol. 1979 May;9(5):615–626. doi: 10.1128/jcm.9.5.615-626.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ristroph J. D., Hedlund K. W., Allen R. G. Liquid medium for growth of Legionella pneumophila. J Clin Microbiol. 1980 Jan;11(1):19–21. doi: 10.1128/jcm.11.1.19-21.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ristroph J. D., Hedlund K. W., Gowda S. Chemically defined medium for Legionella pneumophila growth. J Clin Microbiol. 1981 Jan;13(1):115–119. doi: 10.1128/jcm.13.1.115-119.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tesh M. J., Miller R. D. Amino acid requirements for Legionella pneumophila growth. J Clin Microbiol. 1981 May;13(5):865–869. doi: 10.1128/jcm.13.5.865-869.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Warren W. J., Miller R. D. Growth of Legionnaires disease bacterium (Legionella pneumophila) in chemically defined medium. J Clin Microbiol. 1979 Jul;10(1):50–55. doi: 10.1128/jcm.10.1.50-55.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]