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College of Veterinary Medicine

April Johnson, DVM, MPH, PhD

  • Assistant Professor of Epidemiology and Public Health
  • Department of Comparative Pathobiology
  • Purdue University College of Veterinary Medicine
  • 625 Harrison Street
  • West Lafayette, IN 47907



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Education

  • 2006 - Ph.D. | University of Florida
  • 2006 - MPH | University of Florida
  • 2002 - DVM | University of Illinois

Selected Publications

  • Johnson AJ, Wendland L, Norton TM, Belzer W, Jacobson ER. Development and Use of an Indirect Enzyme-linked Immunosorbent Assay for Detection of Iridovirus Exposure in Gopher Tortoises (Gopherus polyphemus) and Eastern Box Turtles (Terrapene carolina carol
  • Nevarez JG, Mitchell MA, Morgan T, Roy A, Johnson A. 2008. Association of West Nile virus with lymphohistiocytic proliferative cutaneous lesions in American alligators (Alligator mississippiensis) detected by RT-PCR. J Zoo Wildl Med. 39:562-566.
  • Johnson AJ, Pessier AP, Wellehan JFX, Norton TM, Stedman NL, Bloom DC, Belzer W, Titus VR, Wagner R, Brooks J, Spratt J, Jacobson ER. Ranavirus infection of free-ranging and captive box turtles and tortoises in the United States. J Wildl Dis. 44:851-63.
  • Wellehan JF Jr, Childress AL, Marschang RE, Johnson AJ, Lamirande EW, Roberts JF, Vickers ML, Gaskin JM, Jacobson ER. 2008. Consensus nested PCR amplification and sequencing of diverse reptilian, avian, and mammalian orthoreoviruses. Vet Microbiol. 133:34
  • Johnson AJ, Moore ZS, Edelson PJ, Kinnane L, Davies M, Shay DK, Balish A, McCarron M, Blanton L, Finelli L, Averhoff F, Bresee J, Engel J, Fiore A. 2008. Household responses to school closure resulting from an outbreak of influenza B, North Carolina. Emer
  • Pinkerton ME, Wellehan JF Jr, Johnson AJ, Childress AL, Fitzgerald SD, Kinsel MJ. 2008. Columbid herpesvirus-1 in two cooper's hawks (Accipiter cooperii) with fatal inclusion body disease. J Wildl Dis. 44: 622-8.
  • Wellehan JFX, Johnson AJ, Childress AL, Harr KE, Isaza R. 2008. Six novel gammaherpesviruses of Afrotheria provide insight into the early divergence of the gammaherpesvirinae. Vet Microbiol. 127:249-57.
  • Innis CJ, Garner MM, Johnson AJ, Wellehan JFX, Tabaka C, Marschang RE, Nordhausen RW, Jacobson ER. 2007. Antemortem diagnosis and characterization of nasal intranuclear coccidiosis in tortoises. J Vet Diagnost Invest. 19:660-7.
  • Johnson AJ, Pessier AP, Jacobson ER. 2007. Experimental transmission and induction of Ranaviral disease in Western ornate box turtles (Terrapene ornata ornata) and red-eared sliders (Trachemys scripta elegans). Vet Pathol. 44:285-297.
  • Nevarez JG, Mitchell MA, Johnson AJ, Kinler N. 2007. Establishing an association between West Nile Virus exposure and the development of lymphohistiocytic proliferative syndrome of American Alligators (Alligator mississippiensis). J Herpetol Med Surg.17(1
  • Johnson AJ. 2006. Iridovirus infections of captive and free ranging chelonians in the United States. University of Florida. Gainesville, FL.
  • Johnson AJ, Morafka DJ and Jacobson ER. 2006. Screening of captive desert tortoises (Gopherus agassizii) for Mycoplasma agassizii and tortoise herpesvirus in the greater community of San Bernadino, California. J Arid Environ. 67: 192-201.
  • Allender M, Fry M, Irizarry AR, Johnson A, Jones M. 2006. Intracytoplasmic inclusions in leukocytes from an eastern box turtle (Terrapene carolina) associated with iridoviral infection. J Wildl Dis. 42: 677-684.
  • Feldman SH, Wimsatt J, Marschang RE, Johnson AJ, Brown W, Mitchell JC, and Sleeman JM. 2006. A novel mycoplasma detected in association with upper respiratory disease syndrome in free-ranging eastern box turtles (Terrapene carolina carolina) in Virginia.
  • Garner MM, Gardiner CH, Wellehan JFX, Johnson AJ, McNamara T, Linn M, Terrell SP, Childress A, Jacobson ER. 2006. Intranuclear coccidiosis in tortoises: nine cases. Vet Pathol. 43:311-320.
  • Johnson AJ, Pessier AP, Wellehan JFX, Brown R, Jacobson ER. 2005. Identification of a novel tortoise herpesvirus from a California desert tortoise (Gopherus agassizii). Vet Microbiol. 111: 107-116.
  • Govett PD, Harms CA, Johnson AJ, Latimer KS, Wellehan JFX, Fatzinger MH, Christian LS, Kelly TR, and Lewbart GA. 2005. Lymphoid follicular cloacal inflammation associated with a novel herpesvirus in juvenile alligators (Alligator mississippiensis). J Vet
  • Jacobson ER, Johnson AJ, Hernandez JA, Tucker S, Dupuis A, Stevens R, Carbonneau D, and Stark L. 2005. Validation and use of an indirect enzyme-linked immunosorbent assay for detection of antibodies to west Nile virus in American Alligators (Alligator mis
  • Landolfi JA, Wellehan J, Johnson A, Kinsel M. 2005. Molecular confirmation of a fatal, recrudescent human herpesvirus type 1 infection in a white-handed gibbon (Hylobates lar). J Vet Diagn Invest. 17: 369-371.
  • Wellehan JFX, Johnson AJ, Latimer KS, Bischoff K, LaFortune M, Jacobson ER. 2005. Initial characterization of an adenovirus associated with fatal hepatic and lymphoid necrosis in a Meyer's parrot (Poicephalus meyeri). J Avian Med Surg. 19:191-7.
  • Wellehan JFX, Johnson AJ, Latimer KS, Whiteside DP, Crawshaw GJ, Detrisac CJ, Terrell SP, Heard DJ, Childress A, Jacobson ER. 2005. Varanid herpesvirus 1: a novel herpesvirus associated with proliferative stomatitis in green tree monitors (Varanus prasinu
  • Wellehan JFX, Johnson AJ, Harrach B, Benkö M, Pessier AP, Johnson CM, Garner MM, Childress A, Jacobson ER. 2004. Detection and analysis of six lizard adenoviruses by consensus primer PCR provides further evidence of a reptilian origin for the Atadenovirus
  • Johnson A, Brammer L, Wang S, Blanton L, Postema A, Dhara R, Wallis T, Shay D, Bresee J, Klimov A, Cox N. Update: Influenza Activity - United States, Ocboter 1, 2006 - February 3, 2007. MMWR. 56(6): 118-121.
  • Johnson AJ, Origgi FC, Wellehan JFX. 2007. Molecular Diagnostics. In: Infectious Diseases and Pathology of Reptiles: Color Atlas and Text. Jacobson ER (Ed). CRC Press. Atlanta, GA.
  • Johnson AJ, Wellehan JFX. 2005. Amphibian Virology. Vet Clin Exot Anim. 8:53-65.
  • Wellehan JFX, Johnson AJ. 2005. Reptile Virology. Vet Clin Exot Anim. 8:27-52.
  • Adams C, Griswold W, Johnson A, Tabaka C. 2005. Box Turtle and Tortoise Diets Roundtable. J Herpetol Med Surg. 15(2):31-39.