Roger W. (Bill) Stich, MS, PhD


  • B.A.S., Biological Science, Oklahoma State University
  • M.S., Veterinary Parasitology, Oklahoma State University
  • Ph.D., Veterinary Parasitology, Oklahoma State University
  • Postdoctoral Fellow, Molecular and Cellular Parasitology, University of Georgia
  • Postdoctoral Research Associate, Immunoparasitology, Washington State University
Roger W. (Bill) Stich

Building Address: 215 Connaway Hall
Phone Number:


Biology of ticks and tick-borne pathogens, with the goal of developing more effective approaches for control of tick-borne diseases that impact people and domestic animals.


Veterinary Parasitology


Most recent

McMahan CS, Wang D, Beall MJ, Bowman DD, Little SE, Pithua PO, Sharp JL, Stich RW, Yabsley MJ, Lund RB. Factors associated with Anaplasma spp. seroprevalence among dogs in the United States. Parasit Vectors. 2016; In press.

Kaewmongkol S, Kaewmongkol G, Inthong N, Lakkitjaroen N, Sirinarumitr T, Berry CM, Jonsson NN, Stich RW, Jittapalapong S. Variation among Bm86 sequences in Rhipicephalus (Boophilus) microplus ticks collected from cattle across Thailand. Exp Appl Acarol. 2015; 66(2):247-56. PMID: 25777941.

Saetiew N, Simking P, Inpankaew T, Wongpanit K, Kamyingkird K, Wongnakphet S, Stich RW, Jittapalapong S. Prevalence and genetic diversity of Anaplasma marginale infections in water buffaloes in Northeast Thailand. J Trop Med Parasitol. 2015; 38(1): 9-16.

Stich RW, Prior IC. Canine Arthropods: Mites and Ticks, Recommendations from the Companion Animal Parasite Council. Today’s Veterinary Practice. 2015; 5(2):61-66.

Stoffel RT, Johnson GC, Boughan K, Ewing SA, Stich RW. Detection of Ehrlichia chaffeensis in a Naturally Infected Elk (Cervus elaphus) from Missouri, USA. J Med Microbiol Case Reports. 2015; 2(1):e000015.

Kengradomkij C, Inpankaew T, Kamyingkird K, Wongpanit K, Wongnakphet S, Mitchell TJ, Xuan X, Igarashi I, Jittapalapong S, Stich RW. Seroprevalence and risk factors associated with exposure of water buffalo (Bubalus bubalis) to Neospora caninum in northeast Thailand. Vet Parasitol. 2015; 207(1-2):156-60. PMID: 25499824.  

Prior IC, Stich RW. Canine Arthropods: Class Insecta, Recommendations from the Companion Animal Parasite Council. Today’s Veterinary Practice. 2014; 4(6): 51-55.

Stich RW, Blagburn BL, Bowman DD, Carpenter C, Cortinas MR, Ewing SA, Foley D, Foley JE, Gaff H, Hickling GJ, Lash RR, Little SE, Lund C, Lund R, Mather TN, Needham GR, Nicholson WL, Sharp J, Varela-Stokes A, Wang D. Quantitative factors proposed to influence the prevalence of canine tick-borne disease agents in the United States. Parasit Vectors. 2014; 7:417. PMC4167287.  

Stoffel RT, McClure JC, Butcher MM, Johnson GC, Roland W, Cheng C, Sirigireddy KR, Ganta R, Boughan K, Ewing SA, Stich RW. Experimental infection of Rhipicephalus sanguineus with Ehrlichia chaffeensis. Vet Microbiol. 2014; 172:334-8. PMC4098862.

Tick—pathogen interactions

Bremer WG, Schaefer JJ, Wagner ER, Ewing SA, Rikihisa Y, Needham GR, Jittapalapong S, Moore DL, Stich RW. Transstadial and intrastadial experimental transmission of Ehrlichia canis by male Rhipicephalus sanguineus. Vet Parasitol. 2005;131(1-2):95-105.

Stich RW, Olah GA, Brayton KA, Brown WC, Fechheimer M, Green-Church K, Jittapalapong S, Kocan KM, McGuire TC, Rurangirwa FR, Palmer GH. Identification of a novel Anaplasma marginale appendage-associated protein that localizes with actin filaments during intraerythrocytic infection. Infect Immun. 2004;72(12):7257-64.

Unver A, Rikihisa Y, Stich RW, Ohashi N, Felek S. The omp-1 major outer membrane multigene family of Ehrlichia chaffeensis is differentially expressed in canine and tick hosts. Infect Immun. 2002;70(8):4701-4.

Zhi N, Ohashi N, Tajima T, Mott J, Stich RW, Grover D, Telford SR 3rd, Lin Q, Rikihisa Y. Transcript heterogeneity of the p44 multigene family in a human granulocytic ehrlichiosis agent transmitted by ticks. Infect Immun. 2002;70(3):1175-84.

Stich RW, Sauer JR, Bantle JA, Kocan KM. Detection of Anaplasma marginale (Rickettsiales: Anaplasmataceae) in secretagogue-induced oral secretions of Dermacentor andersoni (Acari: Ixodidae) with the polymerase chain reaction. J Med Entomol. 1993;30(4):789-94.

Kocan KM, Stich RW, Claypool PL, Ewing SA, Hair JA, Barron SJ. Intermediate site of development of Anaplasma marginale in feeding adult Dermacentor andersoni ticks that were infected as nymphs. Am J Vet Res. 1990;51(1):128-32.

Stich RW, Kocan KM, Palmer GH, Ewing SA, Hair JA, Barron SJ. Transstadial and attempted transovarial transmission of Anaplasma marginale by Dermacentor variabilis. Am J Vet Res. 1989;50(8):1377-80.

Vertebrate—parasite/pathogen interactions

McClure JC, Crothers ML, Schaefer JJ, Stanley PD, Needham GR, Ewing SA, Stich RW. Efficacy of a doxycycline treatment regimen initiated during three different phases of experimental ehrlichiosis. Antimicrob Agents Chemother. 2010;54(12):5012-20.

Schaefer JJ, Needham GR, Bremer WG, Rikihisa Y, Ewing SA, Stich RW. Tick acquisition of Ehrlichia canis from dogs treated with doxycycline hyclate. Antimicrob Agents Chemother. 2007;51(9):3394-6.

Saville WJ, Stich RW, Reed SM, Njoku CJ, Oglesbee MJ, Wunschmann A, Grover DL, Larew-Naugle AL, Stanek JF, Granstrom DE, Dubey JP. Utilization of stress in the development of an equine model for equine protozoal myeloencephalitis. Vet Parasitol. 2001;95(2-4):211-22.

Jittapalapong S, Stich RW, Gordon JC, Wittum TE, Barriga OO. Performance of female Rhipicephalus sanguineus (Acari: Ixodidae) fed on dogs exposed to multiple infestations or immunization with tick salivary gland or midgut tissues. J Med Entomol. 2000;37(4):601-11.

Parasite biology/ecology

Simking P, Wongnakphet S, Stich RW, Jittapalapong S. Detection of Babesia vogeli in stray cats of metropolitan Bangkok, Thailand. Vet Parasitol. 2010;173(1-2):70-5.

Stich RW, Schaefer JJ, Bremer WG, Needham GR, Jittapalapong S. Host surveys, ixodid tick biology and transmission scenarios as related to the tick-borne pathogen, Ehrlichia canis. Vet Parasitol. 2008;158(4):256-73.

Sarataphan N, Vongpakorn M, Nuansrichay B, Autarkool N, Keowkarnkah T, Rodtian P, Stich RW, Jittapalapong S. Diagnosis of a Trypanosoma lewisi-like infection in a sick infant from Thailand. J Med Microbiol. 2007;56(Pt 8):1118-21.

Dubey JP, Saville WJ, Lindsay DS, Stich RW, Stanek JF, Speert CA, Rosenthal BM, Njoku CJ, Kwok OC, Shen SK, Reed SM. Completion of the life cycle of Sarcocystis neurona. J Parasitol. 2000;86(6):1276-80.


Jittapalapong S, Phichitrasilp T, Chanphao H, Rerkamnuychoke W, Stich RW. Immunization with tick salivary gland extracts: Impact on Salivary Gland Ultrastructure in Rhipicephalus (Boophilus) microplus Collected from Immunized Naturally Infested Cattle. Ann N Y Acad Sci. 2008;1149:200-4.

Jittapalapong S, Jansawan W, Barriga OO, Stich RWReduced incidence of clinical babesiosis in cattle immunized with salivary gland extracts of the cattle tick, Boophilus microplus. Ann N Y Acad Sci. 2004;1026:312-8.

Stich RW, Rice-Ficht AC, Tuo W, Brown WC. Babesia bovis: common protein fractions recognized by oligoclonal B. bovis-specific CD4+ T cell lines from genetically diverse cattle. Exp Parasitol. 1999;91(1):40-51.

Stich RW, Shoda LK, Dreewes M, Adler B, Jungi TW, Brown WC. Stimulation of nitric oxide production in macrophages by Babesia bovis. Infect Immun. 1998;66(9):4130-6

Molecular Diagnostics

Stich RW, Byrum B, Love B, Theus N, Barber L, Shulaw WP. Evaluation of an automated system for non-radiometric detection of Mycobacterium avium paratuberculosis in bovine feces. J Microbiol Methods. 2004;56(2):267-75.

Wagner ER, Bremer WG, Rikihisa Y, Ewing SA, Needham GR, Unver A, Wang X, Stich RW. Development of a p28-based PCR assay for Ehrlichia chaffeensis. Molecular and Cellular Probes. 2004;18(2):111-6.

Stich RW, Rikihisa Y, Ewing SA, Needham GR, Grover DL, Jittapalapong S. Detection of Ehrlichia canis in carrier status canine blood and in individual experimentally infected ticks with a p30-based PCR assay. J Clin Microbiol. 2002;40(2):540-6.

Fekete A, Bantle JA, Halling SM, Stich RW. Amplification fragment length polymorphism in Brucella strains by use of polymerase chain reaction with arbitrary primers. J Bacteriol. 1992;174(23):7778-83.

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