Mark G Ruder

Publications of Mark G Ruder

• Exertional Myopathy in Pileated Woodpeckers (Dryocopus pileatus) Subsequent to Capture.

  Authors: Mark G Ruder, Brandon L Noel, James C Bednarz, M Kevin Keel

  Journal of wildlife diseases. 04/2012; 48(2):514-6.

  Out of 33 Pileated Woodpeckers (Dryocopus pileatus) captured and fitted with radio-transmitters, 12 were later found dead. Three carcasses were recovered and submitted for necropsy. One bird hadOut of 33 Pileated Woodpeckers (Dryocopus pileatus) captured and fitted with radio-transmitters, 12 were later found dead. Three carcasses were recovered and submitted for necropsy. One bird had large pale foci in multiple muscles. Microscopically, skeletal muscle in all three had evidence of severe coagulative necrosis, consistent with capture myopathy.

• Role of multiple hosts in the cross-species transmission and emergence of a pandemic parvovirus.

  Authors: Andrew B Allison, Carole E Harbison, Israel Pagan, Karla M Stucker, Jason T Kaelber, Justin D Brown, Mark G Ruder, M Kevin Keel, Edward J Dubovi, Edward C Holmes, Colin R Parrish

  Journal of virology. 11/2011; 86(2):865-72.

  Understanding the mechanisms of cross-species virus transmission is critical to anticipating emerging infectious diseases. Canine parvovirus type 2 (CPV-2) emerged as a variant of a feline parvovirusUnderstanding the mechanisms of cross-species virus transmission is critical to anticipating emerging infectious diseases. Canine parvovirus type 2 (CPV-2) emerged as a variant of a feline parvovirus when it acquired mutations that allowed binding to the canine transferrin receptor type 1 (TfR). However, CPV-2 was soon replaced by a variant virus (CPV-2a) that differed in antigenicity and receptor binding. Here we show that the emergence of CPV involved an additional host range variant virus that has circulated undetected in raccoons for at least 24 years, with transfers to and from dogs. Raccoon virus capsids showed little binding to the canine TfR, showed little infection of canine cells, and had altered antigenic structures. Remarkably, in capsid protein (VP2) phylogenies, most raccoon viruses fell as evolutionary intermediates between the CPV-2 and CPV-2a strains, suggesting that passage through raccoons assisted in the evolution of CPV-2a. This highlights the potential role of alternative hosts in viral emergence.

• Intoxication of nontarget wildlife with rodenticides in northwestern Kansas.

  Authors: Mark G Ruder, Robert H Poppenga, John A Bryan, Matt Bain, Jim Pitman, M Kevin Keel

  Journal of wildlife diseases. 01/2011; 47(1):212-6.

  The perception of prairie dogs (Cynomys spp.) both as a nuisance species and a keystone species presents a significant challenge to land, livestock, and wildlife managers. Anticoagulant andThe perception of prairie dogs (Cynomys spp.) both as a nuisance species and a keystone species presents a significant challenge to land, livestock, and wildlife managers. Anticoagulant and nonanticoagulant rodenticides are commonly employed to control prairie dog populations throughout their range. Chlorophacinone, and to a lesser extent zinc phosphide, are widely used in northwestern Kansas for controlling black-tailed prairie dog (Cynomys ludovicianus) populations. Although zinc phosphide poisoning of gallinaceous birds is not uncommon, there are few published accounts of nontarget chlorophacinone poisoning of wildlife. We report three mortality events involving nontarget rodenticide poisoning in several species, including wild turkeys (Meleagris gallopavo), a raccoon (Procyon lotor), and an American badger (Taxidea taxus). This includes the first documentation of chlorophacinone intoxication in wild turkeys and an American badger in the literature. The extent of nontarget poisoning in this area is currently unknown and warrants further investigation.

• Pathology in practice. Ranavirus infection.

  Authors: Mark G Ruder, Andrew B Allison, Debra L Miller, M Kevin Keel

  Journal of the American Veterinary Medical Association. 10/2010; 237(7):783-5.

• Association of Mycoplasma corogypsi and Polyarthritis in a Black Vulture (Coragyps atratus) in Virginia.

  Authors: Mark G Ruder, Sanford H Feldman, Arno Wünschmann, David L McRuer

  Journal of wildlife diseases. 08/2009; 45(3):808-16.

  On 10 October 2007, a Black Vulture (Coragyps atratus) was presented to the Wildlife Center of Virginia, Waynesboro, Virginia, USA, because of an inability to fly. Examination revealed multipleOn 10 October 2007, a Black Vulture (Coragyps atratus) was presented to the Wildlife Center of Virginia, Waynesboro, Virginia, USA, because of an inability to fly. Examination revealed multiple swollen, fluctuant joints. The bird suffered from lead toxicosis and had a prominent leukocytosis. Histopathologic evaluation revealed an acute fibrinoheterophilic polyarthritis, and results of routine aerobic and anaerobic culture of joint fluid were negative, although Mycoplasma sp. sequence-specific polymerase chain reaction was positive. Amplification of a portion of the 16S rRNA and subsequent phylogenetic analysis of the amplicon identified Mycoplasma corogypsi. This is the first report of polyarthritis being diagnosed in association with a Mycoplasma sp. in a vulture species. However, fulfilling Koch's postulates through experimental infections is required to draw conclusions concerning an etiologic diagnosis.

• What is your diagnosis? Pulmonary mycobacteriosis.

  Authors: Mark G Ruder, Andrea Ortiz Bernal, David L McRuer, John Spahr

  Journal of avian medicine and surgery. 01/2009; 22(4):359-63.

• What is your diagnosis? Mummified bird with excellent anatomical configuration.

  Authors: Mark G Ruder, James W Carpenter, Susan Kraft

  Journal of avian medicine and surgery. 04/2008; 22(1):74-7.