The objective of this study was to apply transition models to distinguish between factors associated with both incident and persistent trypanosome infections. Data collected from 1,561 cattle were analyzed from a long-term study involving 8 herds in which both trypanosome infections (a total of 56,931 cattle sampling-months) and tsetse (Glossina spp.) challenge were monitored monthly from March 1986 to March 1998. Both pour-on and insecticide-target tsetse control programs and mass treatment with diminazene aceturate before tsetse control were associated with significant decreases in both incidence and persistence of trypanosome infection relative to noncontrol periods, as were seasonal and sex effects. The magnitudes of the effects were, however, often different for new and persistent infections. For persistence of infection, there were 2 trends. In general, the duration of infection increased during the study, despite the regular treatment with diminazene aceturate. The transition model had 2 major benefits. The first was to identify an increasing duration of infections with time, taking into account other factors associated with increasing infection risk. The second was to highlight different patterns in the effects of certain factors on new and persistent trypanosome infections.
Skip Nav Destination
Article navigation
December 2004
Research Article|
December 01 2004
TRANSITION MODELS TO ASSESS RISK FACTORS FOR NEW AND PERSISTENT TRYPANOSOME INFECTIONS IN CATTLE—ANALYSIS OF LONGITUDINAL DATA FROM THE GHIBE VALLEY, SOUTHWEST ETHIOPIA
Y. H. Schukken;
Y. H. Schukken
Department of Population Medicine and Diagnostic Sciences, S3119 Schurmann Hall, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853. yhs2@cornell.edu
Search for other works by this author on:
G. van Schaik;
G. van Schaik
Department of Population Medicine and Diagnostic Sciences, S3119 Schurmann Hall, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853. yhs2@cornell.edu
* Present address: Instituto de Medicina Preventiva Veterinaria, Universidad Austral de Chile, Cas. 567, Valdivia, Chile
Search for other works by this author on:
J. J. McDermott;
J. J. McDermott
Department of Population Medicine and Diagnostic Sciences, S3119 Schurmann Hall, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853. yhs2@cornell.edu
† International Livestock Research Institute, P.O. Box 30709, Nairobi, Kenya
Search for other works by this author on:
G. J. Rowlands;
G. J. Rowlands
Department of Population Medicine and Diagnostic Sciences, S3119 Schurmann Hall, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853. yhs2@cornell.edu
† International Livestock Research Institute, P.O. Box 30709, Nairobi, Kenya
Search for other works by this author on:
S. M. Nagda;
S. M. Nagda
Department of Population Medicine and Diagnostic Sciences, S3119 Schurmann Hall, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853. yhs2@cornell.edu
† International Livestock Research Institute, P.O. Box 30709, Nairobi, Kenya
Search for other works by this author on:
Woudyalew Mulatu;
Woudyalew Mulatu
Department of Population Medicine and Diagnostic Sciences, S3119 Schurmann Hall, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853. yhs2@cornell.edu
‡ International Livestock Research Institute, P.O. Box 5689, Addis Ababa, Ethiopia
Search for other works by this author on:
G. D M. d'Ieteren
G. D M. d'Ieteren
Department of Population Medicine and Diagnostic Sciences, S3119 Schurmann Hall, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853. yhs2@cornell.edu
† International Livestock Research Institute, P.O. Box 30709, Nairobi, Kenya
Search for other works by this author on:
J Parasitol (2004) 90 (6): 1279–1287.
Citation
Y. H. Schukken, G. van Schaik, J. J. McDermott, G. J. Rowlands, S. M. Nagda, Woudyalew Mulatu, G. D M. d'Ieteren; TRANSITION MODELS TO ASSESS RISK FACTORS FOR NEW AND PERSISTENT TRYPANOSOME INFECTIONS IN CATTLE—ANALYSIS OF LONGITUDINAL DATA FROM THE GHIBE VALLEY, SOUTHWEST ETHIOPIA. J Parasitol 1 December 2004; 90 (6): 1279–1287. doi: https://doi.org/10.1645/GE-350
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Sign in via your Institution
Sign in via your InstitutionCiting articles via
CERCARIAL LONGEVITY AND INFECTIVITY OF BOLBOPHORUS DAMNIFICUS, WITH NOTES ON METACERCARIAL PERSISTENCE AND SITE SPECIFICITY IN CHANNEL AND HYBRID CATFISH
Mackenzie A. Gunn, Peter J. Allen, T. Graham Rosser, David J. Wise, Matt J. Griffin
DETECTION OF SPLENDIDOFILARIA SP. (ONCHOCERCIDAE:SPLENDIDOFILARIINAE) MICROFILARIA WITHIN ALASKAN GROUND-DWELLING BIRDS IN THE GROUSE SUBFAMILY TETRAONINAE USING TAQMAN PROBE-BASED REAL-TIME PCR
Stephen E. Greiman, Robert E. Wilson, Briana Sesmundo, Jack Reakoff, Sarah A. Sonsthagen
OCCURRENCE OF EUSTRONGYLIDES EXCISUS (NEMATODA:DIOCTOPHYMATIDAE) IN EUROPEAN PERCH (PERCA FLUVIATILIS) AND GREAT CORMORANT (PHALACROCORAX CARBO) IN LAKE ANNONE, NORTHERN ITALY
Aurora Rusconi, Paola Prati, Roldano Bragoni, Michele Castelli, Umberto Postiglione, Sara Rigamonti, Davide Sassera, Emanuela Olivieri
REVIEW OF THE ROLE OF PARASITIC NEMATODE EXCRETORY/SECRETORY PROTEINS IN HOST IMMUNOMODULATION
Ogadinma K. Okakpu, Adler R. Dillman
REVIEW OF DIOCTOPHYME RENALE: ETIOLOGY, MORPHOLOGY, BIOLOGY, ECOEPIDEMIOLOGY, PATHOGENESIS, SYMPTOMATOLOGY, DIAGNOSIS, TREATMENT, AND PREVENTION
Zully Hernández Russo, Jorge Cárdenas Callirgos, Alberto García-Ayachi, Eric J. Wetzel