Medical Microbiology and Immunology

, Volume 167, Issue 2, pp 107–115

Cytological changes related toBrucella canis variants uptake in vitro

  • Igbo N. Egwu
  • Warren C. Eveland

DOI: 10.1007/BF02123560

Cite this article as:
Egwu, I.N. & Eveland, W.C. Med Microbiol Immunol (1979) 167: 107. doi:10.1007/BF02123560


In this study, evidence for in vitro uptake, invasion, and cytopathogonomic effects of normal and variant strains ofB. canis on tissue culture, is presented.B. canis L-phase were penicillin-induced and these microorganisms produced revertants on penicillin-free media. Tissue culture (LLC-MK2) cells were divided into different normal and variant-infected groups (I–IV), including controls. Bright-field and electron microscopic observations indicated uptake of all the strains and recognizable host cell damage (CPE) to varying degrees. At 72 h after infection, the extent of damage by L-phase was the least (55.5% CPE). The L-phase-derived revertants resulted in 80% damage; this approximates the adverse effect of normalB. canis (85%). In addition to these gross changes, various structural abnormalities, including pyknosis, nuclear disorganization, vacuolation, and karyorrhexis, were apparent. The implications of these findings and the indirect role of the L-phase in brucellosis due toB. canis are discussed.

Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Igbo N. Egwu
    • 1
  • Warren C. Eveland
    • 1
    • 2
  1. 1.Department of Medical Technology, SUNYAB Clinical CenterState University of New York at BuffaloBuffaloUSA
  2. 2.The University of MichiganAnn ArborUSA

Personalised recommendations