title: On the importance of bacterial L-forms in pigeons.
abstract: Following a definition of bacterial L-forms and a literature review on introduction and reversion of bacteria to and from L-forms, respectively, the results of a study comprising 587 samples (316 pigeons and 271 pigeon eggs) are reported. As a control 25 free living pigeons and 25 eggs of those pigeons were used, because antibiotic treatment of these could be excluded. From 79 samples (75 pigeons and 4 eggs) Salmonella typhimurium var. copenhagen (STMC) was isolated (none from the urban pigeons), of them 11 in the L-form from joints and organs and 3 from eggs. 325 of other bacterial isolates were found as L-forms (= approx. 40%). Out of 168 serum samples investigated, 33.9% showed antibodies against STMC. Corresponding antibodies could only be demonstrated in 73.4% of the pigeons with a STMC isolate. The occurrence of L-forms explains resistance to therapy and the failure of vaccines. The high frequency of L-forms is probably an indication of an inconsequential use of antibiotics in managing pigeon diseases.
authors.affiliation: Institut für Geflügelkrankheiten, Ludwig-Maximilians-Universität München.
authors.forename: D
authors.initials: D
authors.lastname: Kiessling
authors.forename: H
authors.initials: H
authors.lastname: Gerlach
authors.forename: J
authors.initials: J
authors.lastname: Kösters
mesh_terms: D000818:Animals; D001715:Bird Diseases / Q000382:microbiology*; D010856:Columbidae / Q000382:microbiology*; D007740:L Forms / Q000302:isolation & purification*; D012481:Salmonella Infections, Animal / Q000382:microbiology*; D012486:Salmonella typhimurium / Q000302:isolation & purification*; D015053:Zygote / Q000382:microbiology