Evaluation of methodologies for counting of ticks in the parasitic life phase
The study aimed to compare the accuracy of tests or methods for counting engorged ticks in cows reared under extensive production systems. In total, 49 adult cows of the Criollo Ñeembucú, Brown Swiss, Brangus and Nelore genotypes were used during the summer in March 2019. Several body regions were reviewed sequentially using the indirect visual method, palpatory and finally the direct method, defined the latter as the gold standard. To estimate the validity and reliability indicators, comparison of the behavior of the receiver operating characteristics curves (ROC) and concordance tests, the Epidat 3.1 program for epidemiological analysis of tabulated data was used. The sensitivity and negative predictive value were markedly higher for the palpatory test. The poor value of the Kappa index revealed that the agreement between the indirect and direct visual method was due to random (p=0.2097). In the palpatory method, the ROC curve showed a larger area compared to the indirect visual method. The results of the homogeneity test of the ROC areas revealed that the difference in the efficacy of both tests was highly significant (p<0.01), proving the limited usefulness of the indirect visual method applied to the count of engorged ticks in the parasitic phase, as opposed to the palpatory method.
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Digital revista |
| Language: | spa |
| Published: |
Universidad Nacional Mayor de San Marcos, Facultad de Medicina Veterinaria
2021
|
| Online Access: | https://revistasinvestigacion.unmsm.edu.pe/index.php/veterinaria/article/view/18802 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| id |
oai:ojs.csi.unmsm:article-18802 |
|---|---|
| record_format |
ojs |
| spelling |
oai:ojs.csi.unmsm:article-188022021-06-25T04:31:52Z Evaluation of methodologies for counting of ticks in the parasitic life phase Evaluación de metodologías para recuento de garrapatas en fase de vida parásita Rodríguez, María Inés Martínez, Roberto Núñez, Lorena ectoparasites bovines palpatory method indirect visual method ectoparásitos bovinos método palpatorio método visual indirecto The study aimed to compare the accuracy of tests or methods for counting engorged ticks in cows reared under extensive production systems. In total, 49 adult cows of the Criollo Ñeembucú, Brown Swiss, Brangus and Nelore genotypes were used during the summer in March 2019. Several body regions were reviewed sequentially using the indirect visual method, palpatory and finally the direct method, defined the latter as the gold standard. To estimate the validity and reliability indicators, comparison of the behavior of the receiver operating characteristics curves (ROC) and concordance tests, the Epidat 3.1 program for epidemiological analysis of tabulated data was used. The sensitivity and negative predictive value were markedly higher for the palpatory test. The poor value of the Kappa index revealed that the agreement between the indirect and direct visual method was due to random (p=0.2097). In the palpatory method, the ROC curve showed a larger area compared to the indirect visual method. The results of the homogeneity test of the ROC areas revealed that the difference in the efficacy of both tests was highly significant (p<0.01), proving the limited usefulness of the indirect visual method applied to the count of engorged ticks in the parasitic phase, as opposed to the palpatory method. El estudio tuvo como objetivo comparar la exactitud de las pruebas o métodos de recuento de garrapatas ingurgitadas en hembras bovinas criadas bajo sistemas de producción extensiva. Se utilizaron 49 vacas adultas de los genotipos Criollo Ñeembucú, Pardo Suizo, Brangus y Nelore durante el estío en marzo de 2019. Se revisaron varias regiones corporales de manera secuencial mediante el método visual indirecto, palpatorio y finalmente el método directo, definido este último como patrón de referencia o gold standard. Para la estimación de los indicadores de validez y fiabilidad, comparación del comportamiento de las curvas de características operacionales del receptor (ROC) y pruebas de concordancia se recurrió al programa para análisis epidemiológico de datos tabulados Epidat 3.1. La sensibilidad y el valor predictivo negativo fueron marcadamente superiores para la prueba palpatoria. El deficiente valor del índice Kappa reveló que el acuerdo entre el método visual indirecto y directo fue debido al azar (p= 0.2097). En el método palpatorio, la curva ROC mostró un área mayor en comparación con el método visual indirecto. Los resultados de la prueba de homogeneidad de las áreas ROC revelaron que la diferencia en cuanto a la eficacia de ambas pruebas fue altamente significativa (p˂0.01), pudiéndose constatar la poca utilidad del método visual indirecto aplicado al recuento de garrapatas ingurgitadas en fase parásita, no así del método palpatorio. Universidad Nacional Mayor de San Marcos, Facultad de Medicina Veterinaria 2021-06-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article application/pdf https://revistasinvestigacion.unmsm.edu.pe/index.php/veterinaria/article/view/18802 10.15381/rivep.v32i3.18802 Revista de Investigaciones Veterinarias del Perú; Vol. 32 No. 3 (2021); e18802 Revista de Investigaciones Veterinarias del Perú; Vol. 32 Núm. 3 (2021); e18802 1682-3419 1609-9117 spa https://revistasinvestigacion.unmsm.edu.pe/index.php/veterinaria/article/view/18802/16814 Derechos de autor 2021 María Inés Rodríguez, Roberto Martínez, Lorena Núñez http://creativecommons.org/licenses/by/4.0 |
| institution |
UNMSM |
| collection |
OJS |
| country |
Perú |
| countrycode |
PE |
| component |
Revista |
| access |
En linea |
| databasecode |
rev-rivep |
| tag |
revista |
| region |
America del Sur |
| libraryname |
Biblioteca de la Facultad de Medicina Veterinaria |
| language |
spa |
| format |
Digital |
| author |
Rodríguez, María Inés Martínez, Roberto Núñez, Lorena |
| spellingShingle |
Rodríguez, María Inés Martínez, Roberto Núñez, Lorena Evaluation of methodologies for counting of ticks in the parasitic life phase |
| author_facet |
Rodríguez, María Inés Martínez, Roberto Núñez, Lorena |
| author_sort |
Rodríguez, María Inés |
| title |
Evaluation of methodologies for counting of ticks in the parasitic life phase |
| title_short |
Evaluation of methodologies for counting of ticks in the parasitic life phase |
| title_full |
Evaluation of methodologies for counting of ticks in the parasitic life phase |
| title_fullStr |
Evaluation of methodologies for counting of ticks in the parasitic life phase |
| title_full_unstemmed |
Evaluation of methodologies for counting of ticks in the parasitic life phase |
| title_sort |
evaluation of methodologies for counting of ticks in the parasitic life phase |
| description |
The study aimed to compare the accuracy of tests or methods for counting engorged ticks in cows reared under extensive production systems. In total, 49 adult cows of the Criollo Ñeembucú, Brown Swiss, Brangus and Nelore genotypes were used during the summer in March 2019. Several body regions were reviewed sequentially using the indirect visual method, palpatory and finally the direct method, defined the latter as the gold standard. To estimate the validity and reliability indicators, comparison of the behavior of the receiver operating characteristics curves (ROC) and concordance tests, the Epidat 3.1 program for epidemiological analysis of tabulated data was used. The sensitivity and negative predictive value were markedly higher for the palpatory test. The poor value of the Kappa index revealed that the agreement between the indirect and direct visual method was due to random (p=0.2097). In the palpatory method, the ROC curve showed a larger area compared to the indirect visual method. The results of the homogeneity test of the ROC areas revealed that the difference in the efficacy of both tests was highly significant (p<0.01), proving the limited usefulness of the indirect visual method applied to the count of engorged ticks in the parasitic phase, as opposed to the palpatory method. |
| publisher |
Universidad Nacional Mayor de San Marcos, Facultad de Medicina Veterinaria |
| publishDate |
2021 |
| url |
https://revistasinvestigacion.unmsm.edu.pe/index.php/veterinaria/article/view/18802 |
| work_keys_str_mv |
AT rodriguezmariaines evaluationofmethodologiesforcountingofticksintheparasiticlifephase AT martinezroberto evaluationofmethodologiesforcountingofticksintheparasiticlifephase AT nunezlorena evaluationofmethodologiesforcountingofticksintheparasiticlifephase AT rodriguezmariaines evaluaciondemetodologiaspararecuentodegarrapatasenfasedevidaparasita AT martinezroberto evaluaciondemetodologiaspararecuentodegarrapatasenfasedevidaparasita AT nunezlorena evaluaciondemetodologiaspararecuentodegarrapatasenfasedevidaparasita |
| _version_ |
1763178973112565761 |