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Peer-reviewed Articles

In Press

Bertram MR, Hamer GL, Hartup BK, Snowden KF, Medeiros MCI, Hamer SA. Haemosporida prevalence and diversity are similar in endangered wild whooping cranes (Grus americana) and sympatric sandhill cranes (Grus canadensis). Parasitology, accepted November 2016.

Grigar MK, Cummings KJ, Rodriguez-Rivera LD, Rankin SC, Johns K, Hamer GL, Hamer SA. Salmonella surveillance among Great-tailed Grackles (Quiscalus mexicanus) and other urban bird species in eastern Texas. Vector Borne Zoonotic Dis, in press.


48. Hodo CL, Bertolini NR, Bernal JC, VandeBerg JL, Hamer SA. 2017. Apparent lack of Trypanosoma cruzi infection in urban roof rats at a Texas non-human primate facility with naturally infected primates. J Am Assoc Lab Anim Sci. 56:1-6.


47. Loss SR, Noden BH, Hamer GL, Hamer SA. 2016. A quantitative synthesis of the role of birds in carrying ticks and tick-borne pathogens in North America. Oecologica 182:947-959.

46. Leahy AM, Cummings KJ, Rodriguez-Rivera LD, Rankin SC, Hamer SA. 2016. Evaluation of fecal Salmonella shedding among dogs at seven animal shelters across Texas. Zoonoses Public Hlth. 63:515-521.

45. Hodo, CL, Goodwin CC, Mayes BC, Mariscal JA, Waldrup KA, Hamer SA. 2016. Trypanosome species, including Trypanosoma cruzi, in sylvatic and peridomestic bats of Texas, USA. Acta Trop. 164:259-266.

44. Castellanos, AA*, Medeiros MCI*, Hamer GL, Morrow ME, Eubanks MD, Teel PD, Hamer SA, Light JE. 2016. Decreased small mammal and on-host tick abundance in association with invasive red imported fire ants (Solenopsis invicta). Biol Lett, 12:20160463. *These authors contributed equally. (Coverage of this research by AgriLife)

43. Vitt JP, Saunders AB, O’Brien MT, Mansell J, Ajithdoss DK, Hamer SA. 2016. Diagnostic features of acute Chagas myocarditis with sudden death in a family of Boxer dogs. J Vet Intern Med. 30: 1210–1215.

42. Comeaux JM1, Curtis-Robles R1, Lewis BC, Cummings KJ, Mesenbrink BT, Leland BR, Bodenchuk MJ, Hamer SA. 2016. Survey of feral swine (Sus scrofa) infection with the agent of Chagas disease (Trypanosoma cruzi) in Texas. J Wildl Dis, 52:627-630. 1These authors contributed equally to this work.

41. 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. 2016. Continental scale surveillance of infectious agents: Tick-, mosquito-, and rodent-borne parasite sampling designs for NEON. Ecosphere, 7(5):e01271.

40. Curtis-Robles R, Lewis BC, Hamer SA. 2016. High Trypanosoma cruzi infection prevalence associated with minimal cardiac pathology among wild carnivores in central Texas. Int J Parasitol Parasites Wildl, 5:117-123.

39. Hodo, CL, Whitley DB, Hamer SA, Corapi WV, Snowden K, Heatley JJ, Rodrigues Hoffmann A. 2016. Histopathological and molecular characterization of Sarcocystis calchasi encephalitis in doves in Texas. J Wildl Dis, 52:395-399.

38. Bryan LK, Hamer SA, Shaw S, Curtis-Robles R, Auckland LD, Hodo CL, Chaffin K, Rech R. 2016. Chagas disease in a Texan horse with neurologic deficits. Vet Parasitol, 216:13-17.

37. Wang H-H, Grant WE, Teel PD, Hamer SA. 2016. Tick-borne infectious agents in nature: simulated effects of changes in host density on spatial-temporal prevalence in infected ticks. Ecological Modelling 323:77-86.


36. Keith RS, Keith BS, Scharf WC, Hamer SA. 2015. Ixodes brunneus (Acarina: Ixodidae) from two bird hosts: A new Michigan tick. Great Lakes Entomologist 48:201-204.

35. Curtis-Robles R, Wozniak EJ, Auckland LD, Hamer GL, Hamer SA. 2015. Combining public health education and disease ecology research: Using citizen science to assess Chagas disease entomological risk in Texas. PLoS Neglected Tropical Diseases, 9(12): e0004235. (Selected by journal editors for a media release.)

34. Wang H-H, Grant WE, Teel PD, Hamer SA. 2015. Simulation of climate-tick-host-landscape interactions: Effects of shifts in the seasonality of host population fluctuations on tick densities. J Vector Ecol 40:247-255.

33. Cohen EB, Auckland LD, Marra PP, Hamer SA. 2015. Avian migrants facilitate invasions of Neotropical ticks and tick-borne pathogens into the United States. Appl Environ Microbiol, 81:8366-8378. (Selected by editors as a Spotlight! Check out coverage of this research at (Texas Standard, The Nature Conservancy, Texas A&M Today, US News & World Reports, Texas Tribune)

32. Hamer SA, Weghorst AC, Auckland LD, Roark EB, Strey OF, Teel PD, Hamer GL. 2015. Comparison of DNA and carbon and nitrogen stable isotope-based techniques for tick blood meal analysis. J Med Entomol, 52:1043-1049.

31. Rodriguez J, Hamer S, Castellanos A, Light J. 2015. Survey of a rodent and tick community in east-central Texas. Southeast Nat, 14:415-424.

30. Bertram MR, Hamer GL, Snowden KF, Hartup BK, Hamer SA. 2015. Coccidian parasites and conservation implications for the endangered whooping crane (Grus americana). PLoS ONE, 10(6): e0127679.

29. Stromdahl E, Nadolny R, Gibbons J, Aukland L, Vince M, Elkins C, Murphy M, Hickling G, Eshoo M, Carolan H, Crowder C, Pilgard M, Hamer S. 2015. Borrelia burgdorferi not confirmed in human-biting Amblyomma americanum ticks from the southeastern United States. J Clin Microbiol. 53:1697-704. (Check out coverage of this research on Tick Encounter website.)


28. Stromdahl E, Hamer SA, Jenkins S, Sloan L, Williamson P, Foster E, Nadolny R, Elkins C, Vince M, Pritt B. 2014. 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). Parasit Vector. 7:553.

27. Hamer SA, Hickling GJ, Walker ED, Tsao JI. 2014.  Increased diversity of zoonotic pathogens and Borrelia burgdorferi strains in established versus incipient Ixodes scapularis populations across the Midwestern United States. Infect Genet Evol. 27:532-542.

26. Tenney T, Curtis-Robles R, Snowden KF, Hamer SA. 2014. Shelter dogs as sentinels for widespread Trypanosoma cruzi transmission across Texas. Emerg Infect Dis. 20:1323-1326. (Check out media coverage at NPR, The Scientist, Discover Magazine).


25. Hamer SA, Bernard AB, Donovan RM, Hartel JA, Wrangham RW, Otali E, Goldberg TL. 2013. Coincident tick infestations in the nostrils of wild chimpanzees and a human in Uganda. Am J Trop Med Hyg 89:924-927. (Check out media coverage at Science, National Geographic, PRI).

24. Hamer SA, Amuzie CJ, Williams KJ, Smedley RC.  2013.  Pathology in Practice: Infectious laryngotracheitis virus in organic laying chickens, Michigan. J Am Vet Med Assoc.  242:477-479.


23. Rosen ME, Hamer SA, Gerhardt RR, Jones CJ, Muller LI, Scott MC, Hickling GJ. 2012. Borrelia burgdorferi not detected in widespread Ixodes scapularis (Acari: Ixodidae) collected from white-tailed deer (Odocoileus virginianus) in Tennessee. J Med Entomol. 49:1473-1480.

22. Hamer SA, Hickling GJ, Keith R, Sidge JL, Walker ED, Tsao JI. 2012. Associations of passerine birds, rabbits, and ticks with Borrelia miyamotoi and Borrelia andersonii in Michigan, U.S.A. Parasite Vector. 5:231.

21. Hamer SA, Goldberg TK, Kitron UD, Brawn JD, Anderson TK, Loss SR, Walker ED, Hamer GL. 2012. Wild birds and the urban ecology of ticks and tick-borne pathogens in Chicago, Illinois, USA, 2005-2010. Emerg Infect Dis. 18:1589-1595. (Paper selected as a media highlight).

20. Margos G, Tsao J, Castillo-Ramírez S, Girard Y, Hamer S, Hoen A, Lane R, Raper S, Ogden N. 2012. Two boundaries separate Borrelia burgdorferi populations in North America. Appl Environ Microbiol. Appl Environ Microbiol. 78:6059-6067.

19. Hamer SA, EW Lehrer, Magle SB.  2012. Wild birds as sentinels for multiple zoonotic pathogens along an urban to rural gradient in greater Chicago, Illinois. Zoonoses Public Hlth. 59:355-364.

18. Pepin KM, Eisen RJ, Mead PS, Piesman J, Fish D, Hoen AG, Barbour A, Hamer SA, Diuk-Wasser MA. 2012. Geographic variation in the relationship between human Lyme disease incidence and the density of infected host-seeking Ixodes scapularis nymphs in the US. Am J Trop Med Hyg. 86:1062-1071.

17. Hamer SA, Hickling GJ, Sidge JL, Walker ED, Tsao JI.  2012.  Synchronous phenology of juvenile Ixodes scapularis, vertebrate host associations, and patterns of Borrelia burgdorferi ribotypes in the midwestern United States.  Ticks Tick Borne Dis.  3:65-75.

16. Diuk-Wasser, MA, Hoen AG, Cislo P, Brinkerhoff R, Hamer SA, Rowland M, Cortinas R, Vourc'h G, Melton F, Hickling GJ, Tsao JI, Bunikis J, Barbour AG, Kitron U, Piesman J, Fish D. 2012. Human risk of infection with Borrelia burgdorferi, the Lyme disease agent, in eastern United States. Am J Trop Med Hyg. 86:320-327.


15. Rydzewski J, Mateus-Pinilla N, Warner R, Hamer S, Weng H-Y, Haramis L. 2011. Ixodes scapularis and Borrelia burgdorferi among diverse habitats within a natural area in east-central Illinois. Vector-borne Zoonot 11:1351-1358.

14. Hamer SA, Hickling GJ, Sidge JL, Rosen ME, Walker ED, Tsao JI. 2011.  Diverse Borrelia burgdorferi strains in a bird-tick cryptic cycle. Appl Environ Microb 77:1999-2007.


13. Scott C, Rosen M, Hamer S, Baker E, Edwards H, Crowder C, Tsao J, Hickling G. 2010.  High-prevalence Borrelia miyamotoi infection among Wild Turkeys (Meleagris gallopavo) in Tennessee. J Med Ent. 47:1238-42.

12. Hamer SA, Tsao JI, Walker ED, Hickling GJ.  2010.  Invasion of the Lyme disease vector Ixodes scapularis: implications for Borrelia burgdorferi endemicity. EcoHealth 7:47-63.

11. 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. 2010. Field and climate-based model for predicting the density of the Lyme disease vector Ixodes scapularis in the United States. Global Ecol Biogeogr 19:504-514.


10. Gatewood AG, Liebman KA, Vourc'h G, Bunikis J, Hamer SA, Cortinas R, Melton F, Cislo P, Kitron U, Tsao J, Barbour AG, Fish D, Diuk-Wasser MA.  2009.  Climate and tick seasonality are predictors of Borrelia burgdorferi genotype distribution.  Appl Environ Micrb. 75:2476-2483.

9. Hamer SA, Tsao JI, Walker ED, Mansfield LS, Foster ES, Hickling GJ.  2009. Canines as sentinels for emerging Ixodes scapularis-borne zoonoses risk. Am J Vet Res.  70:49-56.


8. Hamer SA, Hickling GJ, Roy P, Walker ED, Foster ES, Barber CC, and Tsao JI. 2007.  Zoonotic pathogens in Ixodes scapularis, Michigan.  Emerg Infect Dis. 7:1131-1133.


7. Ward MP, Raim A, Yaremych-Hamer S, Lampman R, and Novak R.  2006.  Does the roosting behavior of birds affect the transmission dynamics of West Nile virus? Am J Trop Med Hyg 75:350-355.

6. Diuk-Wasser M, Gatewood A, Cortinas R, Yaremych-Hamer S, Tsao J, Kitron U, Hickling G, Walker E, Brownstein J, Piesman J, and Fish D. 2006.  Spatial and temporal patterns of nymphal host-seeking I. scapularis in the United States. J Med Ent  43:166-176.


5. Yaremych SA, Novak RJ, Raim AJ, Mankin PC, and Warner RE.  2004.  Home range and habitat use by American Crows in east-central Illinois. Wilson Bull, 116:232-239.

4. Yaremych SA, Levengood JM, Novak RJ, Mankin PC, and Warner RE. 2004.  Gender determination and sex-specific West Nile virus mortality of American Crows. Wildl Soc Bull 32:893-899.

3. Yaremych SA, Warner RE, Mankin PC, Brawn JD, Raim AJ, and Novak RJ. 2004. West Nile virus and high death rate in American Crows. Emerg Infect Dis. 10:709-711.

2. Mulvaney RL, Yaremych SA, Khan SA, Swiader JM, and Horgan BP. 2004. Use of diffusion to determine soil cation-exchange capacity by ammonium saturation. Comm Soil Sci Plant Anal.  35:51-67.


1. Yaremych SA, Warner RE, Van de Wyngaerde MT, Ringia AM, Lampman RL, and Novak RJ. 2003. West Nile virus detection in American Crows.  Emerg Infect Dis. 9:1319-1321.

Book Chapters

Hamer, SA, Cooley TM, Hamer GL. 2011. Avian Diseases. Second Michigan Breeding Bird Atlas.  Available at:

Yaremych SA, Warner RE, Mankin PC, Brawn JD, Raim AJ, and Novak RJ. 2005. West Nile virus causes high mortality in a free-ranging population of American Crows [reprint]. In Wildlife Diseases: Landscape Epidemiology, Spatial Distribution and Utilization of Remote Sensing Technology.  S.K. Majumdar, J. Huffman, F.J. Brenner, and A.I. Panah, editors.  Pennsylvania Academy of Sciences.  Pages 200-204.