In theory, microparasites (parasite strains) competing for hosts show increased virulence (due to selection for rapid multiplication/increased infectiousness). Maybe this plays a role for the Nosema duo? regards, Lennard _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ ******************************************************* * Search the BEE-L archives at: * * http://listserv.albany.edu:8080/cgi-bin/wa?S1=bee-l * *******************************************************