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Sarah A Hamer

Associate Professor - Tenured and Richard Schubot Endowed Chair and Director of Schubot Avian Health Center


Phone: (979) 847-5693

Mailstop: 4458

Department: VIBS

Photo of Hamer, Sarah


  • D.V.M. Veterinary Medicine, Michigan State University 2011
  • Ph.D. Fisheries & Wildlife and Ecology, Michigan State University 2010
  • M.S. Natural Resources and Environmental Sciences, University of Illinois 2003
  • B.S. Natural Resources and Environmental Sciences, University of Illinois 2001


  • Diplomate of the American College of Veterinary Preventive Medicine
  • Texas Veterinary Medical License: 13640
  • Associate Wildlife Biologist®, Certification of The Wildlife Society

Scholarly Interests

Disease ecology and epidemiology; one health initiative; wildlife diseases; avian health; vector-borne diseases; ticks; Lyme disease and other tick-borne zoonoses; Chagas disease; conservation medicine


Trypanosoma cruzi discrete typing unit TcIV implicated in a case of acute disseminated canine Chagas disease
R Curtis-Robles, LD Auckland, CL Hodo, KF Snowden, MB Nabity, SA Hamer
Veterinary Parasitology: Regional Studies and Reports. 2018 12:85-88.
Clear Resin Casting of Arthropods of Medical Importance for Use in Educational and Outreach Activities.
Justin R Bejcek, Rachel Curtis-Robles, Michael Riley, Adrienne Brundage, Sarah A Hamer, Gabriel L Hamer
Journal of insect science (Online). 2018 18(2).
Trypanosoma cruzi Transmission Among Captive Nonhuman Primates, Wildlife, and Vectors.
Carolyn L Hodo, Gregory K Wilkerson, Elise C Birkner, Stanton B Gray, Sarah A Hamer
EcoHealth. 2018
Amblyomma americanum (Acari: Ixodidae) Ticks Are Not Vectors of the Lyme Disease Agent, Borrelia burgdorferi (Spirocheatales: Spirochaetaceae): A Review of the Evidence.
Ellen Y Stromdahl, Robyn M Nadolny, Graham J Hickling, Sarah A Hamer, Nicholas H Ogden, Cory Casal, Garrett A Heck, Jennifer A Gibbons, Taylor F Cremeans, Mark A Pilgard
Journal of medical entomology. 2018 55(3):501-514.
Analysis of over 1500 triatomine vectors from across the US, predominantly Texas, for Trypanosoma cruzi infection and discrete typing units.
Rachel Curtis-Robles, Lisa D Auckland, Karen F Snowden, Gabriel L Hamer, Sarah A Hamer
Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases. 2018 58:171-180.
Bionomics and Spatial Distribution of Triatomine Vectors of Trypanosoma cruzi in Texas and Other Southern States, USA.
Rachel Curtis-Robles, Sarah A Hamer, Sage Lane, Michael Z Levy, Gabriel L Hamer
The American journal of tropical medicine and hygiene. 2018 98(1):113-121.
Martha Hensel, Miranda Bertram, Raquel Rech, Gabriel L Hamer, Sarah A Hamer
Journal of wildlife diseases. 2018 54(1):156-160.
A novel Haemosporida clade at the rank of genus in North American cranes (Aves: Gruiformes).
Miranda R Bertram, Sarah A Hamer, Barry K Hartup, Karen F Snowden, Matthew C Medeiros, Diana C Outlaw, Gabriel L Hamer
Molecular phylogenetics and evolution. 2017 109:73-79.
Haemosporida prevalence and diversity are similar in endangered wild whooping cranes (Grus americana) and sympatric sandhill cranes (Grus canadensis).
Miranda R Bertram, Gabriel L Hamer, Barry K Hartup, Karen F Snowden, Matthew C Medeiros, Sarah A Hamer
Parasitology. 2017 :1-12.
Apparent Lack of Trypanosoma cruzi Infection in Urban Roof Rats (Rattus rattus) at a Texas Facility Housing Naturally Infected Nonhuman Primates
Hodo, Carolyn L, Bertolini, Nicole R, Bernal, John C, VandeBerg, John L, Hamer, Sarah A
Journal of the American Association for Laboratory Animal Science. 2017 56(1):57-62.
Temperate and tropical lineages of brown dog ticks in North America
Jones, Ellen O, Gruntmeir, Jeff M, Hamer, Sarah A, Little, Susan E
Veterinary Parasitology: Regional Studies and Reports. 2017 7:58-61.
Epidemiology and Molecular Typing of Trypanosoma cruzi in Naturally-Infected Hound Dogs and Associated Triatomine Vectors in Texas, USA.
Rachel Curtis-Robles, Karen F Snowden, Brandon Dominguez, Lewis Dinges, Sandy Rodgers, Glennon Mays, Sarah A Hamer
PLoS neglected tropical diseases. 2017 11(1):e0005298.
Widespread Trypanosoma cruzi infection in government working dogs along the Texas-Mexico border: Discordant serology, parasite genotyping and associated vectors.
Alyssa C Meyers, Marvin Meinders, Sarah A Hamer
PLoS neglected tropical diseases. 2017 11(8):e0005819.
Faecal Campylobacter shedding among dogs in animal shelters across Texas.
A M Leahy, K J Cummings, L D Rodriguez-Rivera, S A Hamer, S D Lawhon
Zoonoses and public health. 2017 64(8):623-627.
Trypanosoma cruzi (Agent of Chagas Disease) in Sympatric Human and Dog Populations in "Colonias" of the Lower Rio Grande Valley of Texas.
Rachel Curtis-Robles, Italo B Zecca, Valery Roman-Cruz, Ester S Carbajal, Lisa D Auckland, Isidore Flores, Ann V Millard, Sarah A Hamer
The American journal of tropical medicine and hygiene. 2017 96(4):805-814.
Toward an Ecological Framework for Assessing Reservoirs of Vector-Borne Pathogens: Wildlife Reservoirs of Trypanosoma cruzi across the Southern United States.
Carolyn L Hodo, Sarah A Hamer
ILAR journal. 2017 58(3):379-392.
Salmonella Surveillance Among Great-Tailed Grackles (Quiscalus mexicanus) and Other Urban Bird Species in Eastern Texas.
Mary K Grigar, Kevin J Cummings, Lorraine D Rodriguez-Rivera, Shelley C Rankin, Krista Johns, Gabriel L Hamer, Sarah A Hamer
Vector borne and zoonotic diseases (Larchmont, N.Y.). 2016 16(12):752-757.
Trypanosome species, including Trypanosoma cruzi, in sylvatic and peridomestic bats of Texas, USA.
Carolyn L Hodo, Chloe C Goodwin, Bonny C Mayes, Jacqueline A Mariscal, Kenneth A Waldrup, Sarah A Hamer
Acta tropica. 2016 164:259-266.
A quantitative synthesis of the role of birds in carrying ticks and tick-borne pathogens in North America.
Scott R Loss, Bruce H Noden, Gabriel L Hamer, Sarah A Hamer
Oecologia. 2016 182(4):947-959.
Decreased small mammal and on-host tick abundance in association with invasive red imported fire ants (Solenopsis invicta).
Adrian A Castellanos, Matthew C I Medeiros, Gabriel L Hamer, Michael E Morrow, Micky D Eubanks, Pete D Teel, Sarah A Hamer, Jessica E Light
Biology letters. 2016 12(9):.
Diagnostic Features of Acute Chagas Myocarditis with Sudden Death in a Family of Boxer Dogs.
J P Vitt, A B Saunders, M T O'Brien, J Mansell, D K Ajithdoss, S A Hamer
Journal of veterinary internal medicine. 2016 30(4):1210-5.
Survey of Feral Swine ( Sus scrofa ) Infection with the Agent of Chagas Disease ( Trypanosoma cruzi ) in Texas, 2013-14.
Juliette M Comeaux, Rachel Curtis-Robles, Barbara C Lewis, Kevin J Cummings, Brian T Mesenbrink, Bruce R Leland, Michael J Bodenchuk, Sarah A Hamer
Journal of wildlife diseases. 2016 52(3):627-30.
High Trypanosoma cruzi infection prevalence associated with minimal cardiac pathology among wild carnivores in central Texas.
Rachel Curtis-Robles, Barbara C Lewis, Sarah A Hamer
International journal for parasitology. Parasites and wildlife. 2016 5(2):117-23.
Tick-borne infectious agents in nature: simulated effects of changes in host density on spatial-temporal prevalence in infected ticks
Wang H-H, Grant WE, Teel PD, Hamer SA.
Ecological Modelling. 2016 323:77-86.
Continental scale surveillance of infectious agents: Tick-, mosquito-, and rodent-borne parasite sampling designs for NEON.
Springer YP, Hoekman D, Johnson PTJ, Duffy PA, Hufft RA, Barnett DT, Allan BF, Amman BR, Barker CM, Barrera R, Beard CB, Beati L, Begon M, Blackmore MS, Bradshaw WE, Brisson D, Calisher CH, Childs JE, Diuk-Wasser MA, Douglass RJ, Eisen RJ, Foley DH, Foley JE, Gaff HD, Gardner SL, Ginsberg HS, Glass GE, Hamer SA, Hayden MH, Hjelle B, Holzapfel CM, Juliano SA, Kramer LD, Kuenzi AJ, LaDeau SL, Livdahl TP, Mills JN, Moore CG, Morand S, Nasci RS, Ogden NH, Ostfeld RS, Parmenter RR, Piesman J, Reisen WK, Savage HM, Sonenshine DE, Swei A, Yabsley MJ.
Ecosphere. 2016 7(5):e01271.
Histopathologic and Molecular Characterization of Sarcocystis calchasi Encephalitis in White-winged Doves ( Zenaida asiatica ) and Eurasian Collared Doves ( Streptopelia decaocto ), East-central Texas, USA, 2010-13.
Carolyn L Hodo, Derick B Whitley, Sarah A Hamer, Wayne V Corapi, Karen Snowden, J Jill Heatley, Aline Rodrigues Hoffmann
Journal of wildlife diseases. 2016 52(2):395-9.
Chagas disease in a Texan horse with neurologic deficits.
Laura K Bryan, Sarah A Hamer, Sarah Shaw, Rachel Curtis-Robles, Lisa D Auckland, Carolyn L Hodo, Keith Chaffin, Raquel R Rech
Veterinary parasitology. 2016 216:13-7.
Evaluation of Faecal Salmonella Shedding Among Dogs at Seven Animal Shelters across Texas.
A M Leahy, K J Cummings, L D Rodriguez-Rivera, S C Rankin, S A Hamer
Zoonoses and public health. 2016 63(7):515-521.
Combining Public Health Education and Disease Ecology Research: Using Citizen Science to Assess Chagas Disease Entomological Risk in Texas.
Rachel Curtis-Robles, Edward J Wozniak, Lisa D Auckland, Gabriel L Hamer, Sarah A Hamer
PLoS neglected tropical diseases. 2015 9(12):.
Simulation of climate-tick-host-landscape interactions: Effects of shifts in the seasonality of host population fluctuations on tick densities.
Hsiao-Hsuan Wang, W E Grant, P D Teel, S A Hamer
Journal of vector ecology : journal of the Society for Vector Ecology. 2015 40(2):247-55.
Avian migrants facilitate invasions of neotropical ticks and tick-borne pathogens into the United States.
Emily B Cohen, Lisa D Auckland, Peter P Marra, Sarah A Hamer
Applied and environmental microbiology. 2015 81(24):8366-78.
Comparison of DNA and Carbon and Nitrogen Stable Isotope-based Techniques for Identification of Prior Vertebrate Hosts of Ticks.
Sarah A Hamer, Alex C Weghorst, Lisa D Auckland, E Brendan Roark, Otto F Strey, Pete D Teel, Gabriel L Hamer
Journal of medical entomology. 2015 52(5):1043-9.
Coccidian Parasites and Conservation Implications for the Endangered Whooping Crane (Grus americana).
Miranda R Bertram, Gabriel L Hamer, Karen F Snowden, Barry K Hartup, Sarah A Hamer
PloS one. 2015 10(6):.
Survey of a rodent and tick community in east-central Texas.
Rodriguez J, Hamer S, Castellanos A, Light J
Southeastern Naturalist . 2015
Ixodes brunneus (Acarina: Ixodidae) from two bird hosts: A new Michigan tick.
Keith RS, Keith BS, Scharf WC, Hamer SA.
Great Lakes Entomologist. 2015 48:201-204.
Borrelia burgdorferi not confirmed in human-biting Amblyomma americanum ticks from the southeastern United States.
Ellen Y Stromdahl, Robyn M Nadolny, Jennifer A Gibbons, Lisa D Auckland, Mary A Vince, Chad E Elkins, Michael P Murphy, Graham J Hickling, Mark W Eshoo, Heather E Carolan, Chris D Crowder, Mark A Pilgard, Sarah A Hamer
Journal of clinical microbiology. 2015 53(5):1697-704.
Comparison of phenology and pathogen prevalence, including infection with the Ehrlichia muris-like (EML) agent, of Ixodes scapularis removed from soldiers in the midwestern and the northeastern United States over a 15 year period (1997-2012).
Stromdahl E, Hamer SA, Jenkins S, Sloan L, Williamson P, Foster E, Nadolny R, Elkins C, Vince M, Pritt B
BioMed Central Parasites & Vectors. 2014
Increased diversity of zoonotic pathogens and Borrelia burgdorferi strains in established versus incipient Ixodes scapularis populations across the Midwestern United States.
Sarah A Hamer, Graham J Hickling, Edward D Walker, Jean I Tsao
Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases. 2014 27:531-42.
Shelter dogs as sentinels for Trypanosoma cruzi transmission across Texas.
Trevor D Tenney, Rachel Curtis-Robles, Karen F Snowden, Sarah A Hamer
Emerging infectious diseases. 2014 20(8):1323-6.
Coincident tick infestations in the nostrils of wild chimpanzees and a human in Uganda.
Sarah A Hamer, Andrew B Bernard, Ronan M Donovan, Jessica A Hartel, Richard W Wrangham, Emily Otali, Tony L Goldberg
The American journal of tropical medicine and hygiene. 2013 89(5):924-7.
Pathology in practice. Infectious laryngotracheitis in laying chickens.
Sarah A Hamer, Chidozie J Amuzie, Kurt J Williams, Rebecca C Smedley
Journal of the American Veterinary Medical Association. 2013 242(4):477-9.
Borrelia burgdorferi not detected in widespread Ixodes scapularis (Acari: Ixodidae) collected from white-tailed deer in Tennessee.
M E Rosen, S A Hamer, R R Gerhardt, C J Jones, L I Muller, M C Scott, G J Hickling
Journal of medical entomology. 2012 49(6):1473-80.
Associations of passerine birds, rabbits, and ticks with Borrelia miyamotoi and Borrelia andersonii in Michigan, U.S.A.
Sarah A Hamer, Graham J Hickling, Rich Keith, Jennifer L Sidge, Edward D Walker, Jean I Tsao
Parasites & vectors. 2012 5:231.
Wild birds and urban ecology of ticks and tick-borne pathogens, Chicago, Illinois, USA, 2005-2010.
Sarah A Hamer, Tony L Goldberg, Uriel D Kitron, Jeffrey D Brawn, Tavis K Anderson, Scott R Loss, Edward D Walker, Gabriel L Hamer
Emerging infectious diseases. 2012 18(10):1589-95.
Two boundaries separate Borrelia burgdorferi populations in North America.
Gabriele Margos, Jean I Tsao, Santiago Castillo-Ramírez, Yvette A Girard, Sarah A Hamer, Anne Gatewood Hoen, Robert S Lane, Steve L Raper, Nicholas H Ogden
Applied and environmental microbiology. 2012 78(17):6059-67.
Wild birds as sentinels for multiple zoonotic pathogens along an urban to rural gradient in greater Chicago, Illinois.
S A Hamer, E Lehrer, S B Magle
Zoonoses and public health. 2012 59(5):355-64.
Geographic variation in the relationship between human Lyme disease incidence and the density of infected host-seeking Ixodes scapularis nymphs in the US.
Pepin KM, Eisen RJ, Mead PS, Piesman J, Fish D, Hoen AG, Barbour A, Hamer SA, Diuk-Wasser MA.
Am J Trop Med Hyg.. 2012 86:1062-1071.
Synchronous phenology of juvenile Ixodes scapularis, vertebrate host relationships, and associated patterns of Borrelia burgdorferi ribotypes in the midwestern United States.
Sarah A Hamer, Graham J Hickling, Jennifer L Sidge, Edward D Walker, Jean I Tsao
Ticks and tick-borne diseases. 2012 3(2):65-74.
Human risk of infection with Borrelia burgdorferi, the Lyme disease agent, in eastern United States.
Maria A Diuk-Wasser, Anne Gatewood Hoen, Paul Cislo, Robert Brinkerhoff, Sarah A Hamer, Michelle Rowland, Roberto Cortinas, Gwenaël Vourc'h, Forrest Melton, Graham J Hickling, Jean I Tsao, Jonas Bunikis, Alan G Barbour, Uriel Kitron, Joseph Piesman, Durland Fish
The American journal of tropical medicine and hygiene. 2012 86(2):320-7.
Ixodes scapularis and Borrelia burgdorferi among diverse habitats within a natural area in east-central Illinois.
Rydzewski J, Mateus-Pinilla N, Warner RE, Hamer S, Weng HY
Vector Borne Zoonotic Dis. 2011 11(10):1351-8.
Diverse Borrelia burgdorferi strains in a bird-tick cryptic cycle.
Sarah A Hamer, Graham J Hickling, Jennifer L Sidge, Michelle E Rosen, Edward D Walker, Jean I Tsao
Applied and environmental microbiology. 2011 77(6):1999-2007.
High-prevalence Borrelia miyamotoi infection among [corrected] wild turkeys (Meleagris gallopavo) in Tennessee.
M C Scott, M E Rosen, S A Hamer, E Baker, H Edwards, C Crowder, J I Tsao, G J Hickling
Journal of medical entomology. 2010 47(6):1238-42.
Invasion of the lyme disease vector Ixodes scapularis: implications for Borrelia burgdorferi endemicity.
Sarah A Hamer, Jean I Tsao, Edward D Walker, Graham J Hickling
EcoHealth. 2010 7(1):47-63.
Field and climate-based model for predicting the density of the Lyme disease vector Ixodes scapularis in the United States.
Diuk-Wasser MA, Vourc'h G. Cislo P, Gatewood AG, Melton F, Hamer SA, Rowland M, Cortinas MR, Hickling GJ, Tsao JI, Kitron U, Piesman J, Fish D.
Global Ecol Biogeogr . 2010 19:504-514.
Climate and tick seasonality are predictors of Borrelia burgdorferi genotype distribution.
Anne G Gatewood, Kelly A Liebman, Gwenaël Vourc'h, Jonas Bunikis, Sarah A Hamer, Roberto Cortinas, Forrest Melton, Paul Cislo, Uriel Kitron, Jean Tsao, Alan G Barbour, Durland Fish, Maria A Diuk-Wasser
Applied and environmental microbiology. 2009 75(8):2476-83.
Use of tick surveys and serosurveys to evaluate pet dogs as a sentinel species for emerging Lyme disease.
Sarah A Hamer, Jean I Tsao, Edward D Walker, Linda S Mansfield, Erik S Foster, Graham J Hickling
American journal of veterinary research. 2009 70(1):49-56.
Zoonotic pathogens in Ixodes scapularis, Michigan.
Sarah A Hamer, Pamela L Roy, Graham J Hickling, Edward D Walker, Erik S Foster, Christina C Barber, Jean I Tsao
Emerging infectious diseases. 2008 13(7):1131-3.
Does the roosting behavior of birds affect transmission dynamics of West Nile virus?
Ward MP, Raim A, Yaremych-Hamer S, Lampman R, Novak RJ
Am J Trop Med Hyg. 2006 75(2):350-5.
Spatiotemporal patterns of host-seeking Ixodes scapularis nymphs (Acari: Ixodidae) in the United States.
Diuk-Wasser MA, Gatewood AG, Cortinas MR, Yaremych-Hamer S, Tsao J, Kitron U, Hickling G, Brownstein JS, Walker E, Piesman J, Fish D
J Med Entomol. 2006 43(2):166-76.
Home range and habitat use by American Crows in east-central Illinois
Yaremych SA, Novak RJ, Raim AJ, Mankin PC, and Warner RE.
Wilson Bull. 2004 116:232-239.
Use of diffusion to determine soil cation-exchange capacity by ammonium saturation
Mulvaney RL, Yaremych SA, Khan SA, Swiader JM, and Horgan BP.
Comm Soil Sci Plant Anal. . 2004 35:51-67.
Gender determination and sex-specific West Nile virus mortality of American Crows.
Yaremych SA, Levengood JM, Novak RJ, Mankin PC, and Warner RE.
Wildl Soc Bull. 2004 32:893-899.
West Nile virus and high death rate in American crows.
Yaremych SA, Warner RE, Mankin PC, Brawn JD, Raim A, Novak R
Emerg Infect Dis. 2004 10(4):709-11.
West Nile virus detection in American crows.
Yaremych SA, Warner RE, Van de Wyngaerde MT, Ringia AM, Lampman R, Novak RJ
Emerg Infect Dis. 2003 9(10):1319-21.

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