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Applied and Environmental Microbiology, November 2005, p. 7551-7555, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7551-7555.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Strain- and Genotype-Specific Differences in Virulence of Paenibacillus larvae subsp. larvae, a Bacterial Pathogen Causing American Foulbrood Disease in Honeybees

Elke Genersch,1* Ainura Ashiralieva,1 and Ingemar Fries2

Institute for Bee Research, Friedrich-Engels-Str. 32, 16540 Hohen Neuendorf, Germany,1 Department of Entomology, Swedish University of Agricultural Sciences, Box 7044, 750 07 Uppsala, Sweden2

Received 4 May 2005/ Accepted 23 June 2005

Virulence variations of Paenibacillus larvae subsp. larvae, the causative agent of American foulbrood disease of honeybees, were investigated by analysis of 16 field isolates of this pathogen, belonging to three previously characterized genotypes, as well as the type strain (ATCC 9545) of P. larvae subsp. larvae, with exposure bioassays. We demonstrated that the strain-specific 50% lethal concentrations varied within an order of magnitude and that differences in amount of time for the pathogen to kill 100% of the infected hosts (LT100) correlated with genotype. One genotype killed rather quickly, with a mean LT100 of 7.8 ± 1.7 days postinfection, while the other genotypes acted more slowly, with mean LT100s of 11.2 ± 0.8 and 11.6 ± 0.6 days postinfection.

* Corresponding author. Mailing address: Institute for Bee Research, Friedrich-Engels-Str. 32, 16540 Hohen Neuendorf, Germany. Phone: 49 (0)3303-293833. Fax: 49 (0)3303-293840. E-mail: elke.genersch{at}rz.hu-berlin.de.

Applied and Environmental Microbiology, November 2005, p. 7551-7555, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7551-7555.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Rauch, S., Ashiralieva, A., Hedtke, K., Genersch, E. (2009). Negative Correlation between Individual-Insect-Level Virulence and Colony-Level Virulence of Paenibacillus larvae, the Etiological Agent of American Foulbrood of Honeybees. Appl. Environ. Microbiol. 75: 3344-3347 [Abstract] [Full Text]  
  • Genersch, E., Forsgren, E., Pentikainen, J., Ashiralieva, A., Rauch, S., Kilwinski, J., Fries, I. (2006). Reclassification of Paenibacillus larvae subsp. pulvifaciens and Paenibacillus larvae subsp. larvae as Paenibacillus larvae without subspecies differentiation.. Int. J. Syst. Evol. Microbiol. 56: 501-511 [Abstract] [Full Text]  


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