DOI: 10.1051/apido:2001122

Apidologie 32 (2001) 199-214

Implications of horizontal and vertical pathogen transmission for honey bee epidemiology

Ingemar Fries^a and Scott Camazine<sup>b

a</sup>  Department of Entomology, Swedish University of Agricultural Sciences, Box 7044, 750 07 Uppsala, Sweden
^b  Department of Entomology, Penn State University, 539 ASI Building, University Park, PA 16802, USA

(Received 15 January 2001; accepted 8 March 2001)

Abstract
The degree to which a disease evolves to be virulent depends, in part, on whether the pathogen is transmitted horizontally or vertically. Eusocial insect colonies present a special case since the fitness of the pathogen depends not only on the ability to infect and spread between individuals within a colony, but also on the ability to spread to new individuals in other colonies. In honey bees, intercolony transmission of pathogens occurs horizontally (by drifting or robbing) and vertically (through swarming). Vertical transmission is likely the most important route of pathogen infection of new colonies. Theory predicts that this should generally select for benign host-parasite relationships. Indeed, most honey bee diseases exhibit low virulence. The only major exception is American foulbrood (AFB). In light of current ideas in evolutionary epidemiology, we discuss the implications of horizontal and vertical pathogen transmission for virulence of AFB and other honey bee diseases.

Key words: honeybee / epidemiology / pathogen transmission / horizontal transmission / vertical transmission

Correspondence and reprints: Ingemar Fries
    e-mail: Ingemar.Fries@entom.slu.se

© INRA, EDP Sciences, DIB, AGIB 2001