Main areas of research Riemerella infections in poultryErysipelas in poultry - pathology, serotyping and epidemiologyRespiratory diseases of poultry caused by viruses, including interactions between viruses, mycoplasma, bacteria and environment Salmonella infections in poultry Development and application of molecular methods for subspecies and serovar characterization of S. enterica Antigenic characterization of S. enterica serovar Berta and development of sensitive and specific immunoassays for detection of infections caused by this serovar Clonal transmission of S. enterica Plasmid mediated virulence expression Host specificity and pathogenesis Risk factors Taxonomic, ecological, epidemiological, population genetics, and host-parasite interaction studies of organisms classified with Pasteurellaceae Pohl 1981 Immunosuppressive infections in poultry. Pathogenesis and epidemiology, including interactions with other immunosuppressive agents Zoonoses associated with poultry and poultry products Risk factors, transmission, virulence and population genetics of avian E. coli infections Helminth infections in poultry and interactions between the host and combined infections caused by helminths, virus and bacteria Streptococci and enterococci. New old emerging disease agents in poultry and humans Diseases associated with free-range and organic farming systems Diseases in village poultry in developing countries Pathogenesis of valvular endocarditis and studies on antimicrobial therapy using a natural chicken model Genetic characterization of populations of potential pathogenic bacteria during subclinical infections and disease outbreaks in large populations Hatchery - and processing plant hygiene