DVM, MVetSc, PhD, Dipl ACVP
Animal Health Centre, British Columbia Ministry of Agriculture
1767 Angus Campbell Road
Abbotsford, British Columbia V3G 2M3

Dr. Chelsea Himsworth received her DVM from the Western College of Veterinary Medicine in 2007, before staying on to complete a Masters of Veterinary Science and Senior Residency in Anatomic Pathology with a Wildlife Health focus in 2010. She went on to successfully complete the board certification exam and achieve Diplomate status with the American College of Veterinary Pathologists. Dr. Himsworth then joined the PhD program in the School of Population and Public Health, University of British Columbia and completed the program in 2014. Currently, she is a Diagnostic Pathologist and the Leader for Veterinary Science and Diagnostics at the Animal Health Centre, the provincial veterinary diagnostic laboratory for British Columbia. She is also the BC Regional Director for the Canadian Wildlife Health Cooperative.

Publications since 2010:

Rothenburger JL, Himsworth CG, Clifford CB, Ellis J, Treuting PM, Leighton FA. Respiratory pathology and pathogens in wild urban rats (Rattus norvegicus and Rattus rattus). Veterinary Pathology. Accepted May 31, 2015.

Christiansen EF, Himsworth CG, Hill JE, Haulena M. 2015. Infection of a Goeldi’s Monkey (Callimico goeldii) with a European Strain of Echinococcus multilocularis in a Canadian Institution. Journal of Zoo and Wildlife Medicine 46(2): 378-381.

Himsworth CG, Zabek E, Desruisseau A, Parmly EJ, Reid-Smith R, Jardine CM, Tang P, Patrick DM. Prevalence and characteristics of Escherichia coli and Salmonella spp. in the feces of wild urban Norway and black rats (Rattus norvegicus and Rattus rattus) from an inner-city neighborhood of Vancouver, Canada. Journal of Wildlife Diseases, Accepted January 13, 2015.

Himsworth CG, Kosoy M, Bai Y, Wood H, Dibernardo A, Lindsay R, Bidulka J, Tang P, Jardine CM, Patrick DM. 2015. An investigation of Bartonella spp., Rickettsia typhi, and Seoul hantavirus in rats (Rattus spp.) from an inner-city neighborhood of Vancouver, Canada: Is pathogen presence a reflection of global and local rat population structure? Vector Borne and Zoonotic Diseases 15(1): 21-26.

Rothenburger JL, Himsworth CG, Lejeune M, Treuting PM, Leighton FA. 2014. Lesions associated with Eucoleus sp. in the non-glandular stomach of wild urban rats (Rattus norvegicus). International Journal for Parasitology: Parasites & Wildlife 3(2): 95-101.

Himsworth CG, Parsons KL, Feng AYT, Kerr T, Jardine CM, Patrick DM. 2014. A Mixed Methods Approach to Exploring the Relationship Between Norway Rat (Rattus norvegicus) Abundance and Features of the Urban Environment in an Inner-City Neighborhood of Vancouver, Canada. PLoS One 9(5): e9776.

Rothenburger JL, Himsworth CG, Treuting PM, Leighton FA. 2015 Survey of cardiovascular pathology in wild urban Rattus norvegicus and Rattus rattus. Veterinary Pathology 52: 201-208.

Rothenburger JL, Himsworth CG, Chang V, Lejeune M, Leighton FA. 2014. Capillaria hepatica in wild Norway rats (Rattus norvegicus) from Vancouver, Canada. Journal of Wildlife Diseases 50(3): 628-633.

Himsworth CG, Jardine CM, Parsons KL, Feng AYT, Patrick DM. 2014. The characteristics of wild rat (Rattus spp.) populations with a focus on factors critical to the understanding of rat-associated zoonoses. PLoS One 9(3): e91654.

Himsworth CG, Zabek E, Tang P, Parsons KL, Koehn M, Jardine GM, Patrick DM. 2014. Bacteria isolated from conspecific bite wounds in Norway and black rats: Implications for rat bite-associated infections in people. Vector Borne and Zoonotic Diseases 14(2): 94-100.

Himsworth CG, Miller RR, Montoya V, Hoang L, Romney MG, Al-Rawahi GN, Kerr T, Jardine CM, Patrick DM, Tang P, Weese JS. 2014. Carriage of methicillin-resistant Staphylococcus aureus by wild urban Norway rats (Rattus norvegicus). PLoS One 9(2): e87983.

Himsworth CG, Patrick DM, Mak S, Jardine CM, Tang P, Weese JS. 2014. Carriage of Clostridium difficile by wild urban Norway and black rats (Rattus norvegicus and Rattus rattus). Applied and Environmental Microbiology 80(4): 1299-1305.

Anholt H, Himsworth CG, Rothenburger J, Proctor H, Patrick DM. 2014. Notoedres muris in black and Norway rats (Rattus rattus and Rattus norvegicus) from inner-city Vancouver, Canada. Journal of Wildlife Diseases 50(1): 104-108.

Feng AYT, Himsworth CG. 2014. The secret life of the city rat: A review of the ecology of urban Norway and black rats. Urban Ecosystems 17(1): 149-162.

Himsworth CG, Bidulka J, Parsons KL, Feng AYT, Tang P, Jardine CM, Kerr T, Mak S, Robinson J, Patrick DM. 2013. Ecology of Leptospira interrogans in Norway rats (Rattus norvegicus) in an Inner-City Neighborhood of Vancouver, Canada. PLoS Neglected Tropical Diseases 7(6): e2270.

Himsworth CG, Parsons KL, Jardine C, Patrick DM. 2012. Rats, Cities, People, and Pathogens: A systematic review and narrative synthesis of literature regarding the epidemiology of rat-associated zoonoses in urban centers. Vector-Borne and Zoonotic Diseases 13(6): 349-359.

Himsworth CG, Patrick DM, Parsons, KL, Feng A, Weese JS. 2012. Carriage of methicillin-resistant Staphylococcus pseudintermedius by wild Norway Rats. Emerging Infectious Diseases 19(1): 169-170.

Himsworth CG, Feng AYT, Parsons KL, Kerr T, Patrick DM. 2012. Using experiential knowledge to understand urban rat ecology: A survey of Canadian pest control professionals. Urban Ecosystems 16(2): 341-350.

Himsworth CG, Rock M. 2013. Pet ownership, other domestic relationships, and satisfaction with life among seniors: Results from a Canadian national survey. Anthrozoos 26(2): 295-305.

Himsworth CG, McInnes CJ, Coulter L, Everest D, Hill J. Characterization of a novel poxvirus in a North American red squirrel (Tamiasciurus hudsonicus). Journal of Wildlife Diseases 49(1): 173-179.

Himsworth CG. 2010. If a pig coughs in Mexico the whole world should hear it. The Lancet Infectious Diseases 10(8): 511-512.

Himsworth CG, Skinner S, Chaban B, Jenkins E, Wagner BA, Harms NJ, Leighton FA, Thompson RCA, Hill JE. 2010. Multiple zoonotic pathogens indentified in canine feces collected from a remote Canadian Indigenous community. American Journal of Tropical Medicine and Hygiene 83(2): 338-341.

Himworth CG, Haulena M, Lambourn DM, Gaydos JK, Huggins J, Calambokidis J, Ford JKB, Zaremba K, Raverty S. 2010. Pathology and epidemiology of phocid herpesvirus-1 infection in wild and rehabilitating harbor seals (Phoca vitulina) in the Northeastern Pacific. Journal of Wildlife Diseases 46(3): 1046-0151.

Granson H, Grahn B, Parker D, Himsworth CG. 2010. Bilateral cataracts in a coyote (Canis latrans) pup from Saskatchewan, Canada. Journal of Zoo and Wildlife Medicine 41(2):368-370.

Himsworth CG, Elkin BT, Nishi JS, Neimanis AS, Wobeser GA, Turcotte C, Leighton FA. 2010. An outbreak of bovine tuberculosis in an intensively managed conservation herd of wild bison in the Northwest Territories. Canadian Veterinary Journal 51: 593-597.

Himsworth CG, Jenkins E, Hill JE, Nsungu M, Ndao M, Thompson RCA, Covacin C, McConnell A, Leighton FA, Skinner S. 2010. The emergence of sylvatic Echinococcus granulosus as a parasitic zoonosis of public health concern in an Indigenous Canadian community. American Journal of Tropical Medicine and Hygiene 82(4): 643-645.

Himsworth CG, Elkin BT, Nishi JS, Epp T, Lyashchenko KP, Surujballi O, Turcotte C, Esfandiari J, Greenwald R, Leighton FA. 2010. Comparison of test performance and evaluation of novel immunoassays for tuberculosis in a captive herd of wood bison naturally infected with Mycobacterium bovis. Journal of Wildlife Diseases 46(1):76-86.

Current Graduate Students:

Michelle Coombe, MSc Candidate, School of Population and Public Health, University of British Columbia. Program Duration: 2015 – 2017. Project: ” Understanding the ecology of Toxoplasma gondii and other apicomplexan parasites in rats and people from an inner-city neighborhood.”

Kaylee Byers, PhD Candidate, Interdisciplinary Studies, University of British Columbia. Program Duration: 2013 – 2017. Project: “Rats, parasites, and their associated pathogens.”

Jamie Rothenburger, PhD Candidate, Pathobiology, University of Guelph. Program Duration: 2014 – 2018. Project: “Factors affecting the ecology of rat-associated zoonoses in urban settings.”

Dr. Himsworth’s research is focused on the ecology of infectious diseases, particularly zoonotic diseases (i.e., diseases transmissible from animals to people) and diseases involving free-ranging wildlife. Current research project include:

– The Vancouver Rat Project: An interdisciplinary study aiming to better understand the public health risks associate with urban rats (www.vancouverratproject.com). Funders include the Canadian Institutes of Health Research, the Natural Sciences Research Council.

– The Avian Influenza Sediment Study: The goal of this study is to determine if genomics technologies can be used to detect Avian Influenza Virus (AIV) in wetland sediments with a view to developing an efficient and effective early warning system for the incursion of pathogenic AIV in wild waterfowl populations. Funders Include the Genome BC/Genome Canada, the BC Ministry of Agriculture, and the Canadian Food Inspection Agency.