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& Biomedical Sciences
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Ronald Martens

Ronald Martens

Professor Emeritus Department of Large Animal Clinical Sciences
Contact
RMARTENS@cvm.tamu.edu
9798453541
TAMU Mailstop: 4475

Research and Scholarly Interests

Equine infectious diseases - pathogenesis, diagnosis and prevention. Primary focus: Rhodococcus equi foal pneumonia.

EDUCATION

  • D.V.M., Michigan State University, 1965
  • Infectious Disease
  • Chaffin MK, Cohen ND, Martens RJ, O'Conor M, Bernstein LR (2011). Evaluation of the efficacy of gallium maltolate for chemoprophylaxis against pneumonia caused by Rhodococcus equi infection in foals. AM J VET RES. 7, 945-57
  • Martens RJ, Cohen ND, Fajt VR, Nerren JR, Chaffin MK, Taylor RJ, Bernstein LR (2010). Gallium maltolate: safety in neonatal foals following multiple enteral administrations. J VET PHARMACOL THER. 2, 208-12
  • Liu T, Nerren J, Liu M, Martens R, Cohen N (2009). Basal and stimulus-induced cytokine expression is selectively impaired in peripheral blood mononuclear cells of newborn foals. VACCINE. 5, 674-83
  • Nerren JR, Martens RJ, Payne S, Murrell J, Butler JL, Cohen ND (2009). Age-related changes in cytokine expression by neutrophils of foals stimulated with virulent Rhodococcus equi in vitro. VET IMMUNOL IMMUNOPATHOL. 3-4, 212-9
  • Nerren JR, Payne S, Halbert ND, Martens RJ, Cohen ND (2009). Cytokine expression by neutrophils of adult horses stimulated with virulent and avirulent Rhodococcus equi in vitro. VET IMMUNOL IMMUNOPATHOL. 1-2, 135-43
  • Chaffin MK, Cohen ND, Martens RJ (2008). Chemoprophylactic effects of azithromycin against Rhodococcus equi-induced pneumonia among foals at equine breeding farms with endemic infections. J AM VET MED ASSOC. 7, 1035-47
  • Cohen ND, Carter CN, Scott HM, Chaffin MK, Smith JL, Grimm MB, Kuskie KR, Takai S, Martens RJ (2008). Association of soil concentrations of Rhodococcus equi and incidence of pneumonia attributable to Rhodococcus equi in foals on farms in central Kentucky. AM J VET RES. 3, 385-95
  • Martens RJ, Mealey K, Cohen ND, Harrington JR, Chaffin MK, Taylor RJ, Bernstein LR (2007). Pharmacokinetics of gallium maltolate after intragastric administration in neonatal foals. AM J VET RES. 10, 1041-4
  • Grimm MB, Cohen ND, Slovis NM, Mundy GD, Harrington JR, Libal MC, Takai S, Martens RJ (2007). Evaluation of fecal samples from mares as a source of Rhodococcus equi for their foals by use of quantitative bacteriologic culture and colony immunoblot analyses. AM J VET RES. 1, 63-71
  • Halbert ND, Cohen ND, Slovis NM, Faircloth J, Martens RJ (2006). Variations in equid SLC11A1 (NRAMP1) genes and associations with Rhodococcus equi pneumonia in horses. J VET INTERN MED. 4, 974-9
  • Harrington JR, Martens RJ, Cohen ND, Bernstein LR (2006). Antimicrobial activity of gallium against virulent Rhodococcus equiin vitro and in vivo. J VET PHARMACOL THER. 2, 121-7
  • Martens RJ, Cohen ND, Chaffin MK, Waskom JS (2002). Association of pneumonia in foals caused by Rhodococcus equi with farm soil geochemistry. AM J VET RES. 1, 95-8
  • Martens RJ, Cohen ND, Jones SL, Moore TA, Edwards JF (2005). Protective role of neutrophils in mice experimentally infected with Rhodococcus equi. INFECT IMMUN. 10, 7040-2
  • Halbert ND, Reitzel RA, Martens RJ, Cohen ND (2005). Evaluation of a multiplex polymerase chain reaction assay for simultaneous detection of Rhodococcus equi and the vapA gene. AM J VET RES. 8, 1380-5
  • Harrington JR, Golding MC, Martens RJ, Halbert ND, Cohen ND (2005). Evaluation of a real-time quantitative polymerase chain reaction assay for detection and quantitation of virulent Rhodococcus equi. AM J VET RES. 5, 755-61
  • Cohen ND, O'Conor MS, Chaffin MK, Martens RJ (2005). Farm characteristics and management practices associated with development of Rhodococcus equi pneumonia in foals. J AM VET MED ASSOC. 3, 404-13
  • Chaffin MK, Cohen ND, Martens RJ, Edwards RF, Nevill M, Smith R 3rd (2004). Hematologic and immunophenotypic factors associated with development of Rhodococcus equi pneumonia of foals at equine breeding farms with endemic infection. VET IMMUNOL IMMUNOPATHOL. 1-2, 33-48
  • Cohen ND, Harrington J, Gros P, Del Castro L, Meyer D, Martens RJ (2004). Nramp1 deletion does not confer susceptibility to Rhodococcus equi infection in mice. IMMUNOGENETICS. 1, 65-7
  • Chaffin MK, Cohen ND, Martens RJ, Edwards RF, Nevill M (2003). Foal-related risk factors associated with development of Rhodococcus equi pneumonia on farms with endemic infection. J AM VET MED ASSOC. 12, 1791-9
  • Jordan MC, Harrington JR, Cohen ND, Tsolis RM, Dangott LJ, Weinberg ED, Martens RJ (2003). Effects of iron modulation on growth and viability of Rhodococcus equi and expression of virulence-associated protein A. AM J VET RES. 11, 1337-46
  • Boyd NK, Cohen ND, Lim WS, Martens RJ, Chaffin MK, Ball JM (2003). Temporal changes in cytokine expression of foals during the first month of life. VET IMMUNOL IMMUNOPATHOL. 1-2, 75-85
  • Cohen ND, Smith KE, Ficht TA, Takai S, Libal MC, West BR, DelRosario LS, Becu T, Leadon DP, Buckley T, Chaffin MK, Martens RJ (2003). Epidemiologic study of results of pulsed-field gel electrophoresis of isolates of Rhodococcus equi obtained from horses and horse farms. AM J VET RES. 2, 153-61
  • Chaffin MK, Cohen ND, Martens RJ (2003). Evaluation of equine breeding farm management and preventative health practices as risk factors for development of Rhodococcus equi pneumonia in foals. J AM VET MED ASSOC. 4, 476-85
  • Chaffin MK, Cohen ND, Martens RJ (2003). Evaluation of equine breeding farm characteristics as risk factors for development of Rhodococcus equi pneumonia in foals. J AM VET MED ASSOC. 4, 467-75
  • Arriaga JM, Cohen ND, Derr JN, Chaffin MK, Martens RJ (2002). Detection of Rhodococcus equi by polymerase chain reaction using species-specific nonproprietary primers. J VET DIAGN INVEST. 4, 347-53
  • Smith R 3rd, Chaffin MK, Cohen ND, Martens RJ (2002). Age-related changes in lymphocyte subsets of quarter horse foals. AM J VET RES. 4, 531-7
  • Horowitz ML, Cohen ND, Takai S, Becu T, Chaffin MK, Chu KK, Magdesian KG, Martens RJ (2001). Application of Sartwell's model (lognormal distribution of incubation periods) to age at onset and age at death of foals with Rhodococcus equi pneumonia as evidence of perinatal infection. J VET INTERN MED. 3, 171-5
  • Martens RJ, Takai S, Cohen ND, Chaffin MK, Liu H, Sakurai K, Sugimoto H, Lingsweiler SW (2000). Association of disease with isolation and virulence of Rhodococcus equi from farm soil and foals with pneumonia. J AM VET MED ASSOC. 2, 220-5
  • Martens JG, Stephens KA, Kerchner LJ, Heck FC, Martens RJ (1991). Fibronectin concentration in plasma of mares and neonatal foals. RES VET SCI. 3, 311-4
  • Seahorn TL, Carter GK, Martens JG, Crandell RA, Martin MT, Scrutchfield WL, Cummins JM, Martens RJ (1990). Effects of human alpha interferon on experimentally induced equine herpesvirus-1 infection in horses. AM J VET RES. 12, 2006-10
  • Cornick J, Martens J, Martens R, Crandell R, McConnell S, Kit S (1990). Safety and efficacy of a thymidine kinase negative equine herpesvirus-1 vaccine in young horses. CAN J VET RES. 2, 260-6
  • Martens RJ, Martens JG, Renshaw HW, Hietala SK (1987). Rhodococcus equi: equine neutrophil chemiluminescent and bactericidal responses to opsonizing antibody. VET MICROBIOL. 3, 277-86
  • Chaffin MK, Cohen ND, Martens RJ, O'Conor M, Bernstein LR (2011). Evaluation of the efficacy of gallium maltolate for chemoprophylaxis against pneumonia caused by Rhodococcus equi infection in foals. AM J VET RES. 7, 945-57

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