Effects of <i>Yersinia pestis</i> Fra-Operon Carriage on the Cellular Morphologic Features of the Recipient <i>Yersinia pseudotuberculosis</i> Strain

• Main Authors: A. A. Byvalov, A. V. Chernyadiev, I. V. Marakulin, K. E. Gavrilov
• Format: Article
• Language: Russian
• Published: Federal Government Health Institution, Russian Research Anti-Plague Institute “Microbe” 2008-04-01
• Series: Проблемы особо опасных инфекций
• Subjects: <i>yersinia pseudotuberculosis</i>; microbial culture; fra-operon; f1-antigen; fra⁺ and fra^- isogenic variants
• Online Access: https://journal.microbe.ru/jour/article/view/1053

Cellular morphologic variations of Yersinia pseudotuberculosis strain 164/84 were assessed depending on the cultivation temperature and the plague agent's fra-operon carriage by these cells. Notably slower population growth of the two isogenic variants of strain 164/84 (fra+ and fra-) was observed at the cultivation temperatures of 4 to 6 °C as compared with those at 26-28 °C and 36-38 °C. Only late growth stages at the temperatures of 36 to 38 °C brought about significant differences between the fra+ and fra- cell variants expressed in the occurrence of relatively bigger cells in the population of the capsule forming Y. pseudotuberculosis variant.