Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns
This study was aimed at understanding some aspects of the canine heartworm epidemiology in the southern distribution limit of the parasite in South America. With this objective, 19,298 blood samples of owned dogs from 65 localities of 13 municipalities of Buenos Aires Province were tested for Dirofi...
Guardado en:
| Publicado: |
2011
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03044017_v176_n2-3_p240_Vezzani http://hdl.handle.net/20.500.12110/paper_03044017_v176_n2-3_p240_Vezzani |
| Aporte de: |
| id |
paper:paper_03044017_v176_n2-3_p240_Vezzani |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_03044017_v176_n2-3_p240_Vezzani2023-06-08T15:29:44Z Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns Argentina Dirofilaria immitis Dogs Heartworm prevalence Nematodes Spatial analysis age article blood sampling Dirofilaria immitis dirofilariasis dog environmental factor epidemiological data geographic distribution host susceptibility infection risk male nonhuman parasite prevalence parasite transmission population density soil property South America trend study Animals Argentina Dirofilaria immitis Dirofilariasis Dog Diseases Dogs Female Male Risk Factors Time Factors Canis familiaris Dirofilaria immitis Nematoda This study was aimed at understanding some aspects of the canine heartworm epidemiology in the southern distribution limit of the parasite in South America. With this objective, 19,298 blood samples of owned dogs from 65 localities of 13 municipalities of Buenos Aires Province were tested for Dirofilaria immitis circulating microfilariae and/or female antigens. The overall heartworm prevalence was 1.63% by microhematocrit tube technique (n = 19,136), 3.65% by modified Knott (n = 713), and 14.41% by antigen test kit (n = 118). Microfilaremic dogs showed a median of 1933 microfilariae per millilitre (q1 = 375, q3 = 5625, n = 100). Male dogs belonging to breeds of short hair and large size recorded significantly higher prevalences than the other categories. Also, the prevalence increased significantly with the age and only dogs younger than 12 months were not found infected. A clear decreasing trend of the annual prevalence was observed during the whole study period, from 3.91% in 2001 to 1.17% in 2006. D. immitis-infected dogs were detected in 32 localities of 9 municipalities (prevalence range: 0.2-6.7%). Generalized linear models were used to assess associations between heartworm prevalence and environmental variables. The resulting significant models were univariate and included variables related with soil cover and human population density. The best model predicted maximum heartworm prevalences around middle values of bare soil cover, and lower at high and low covers. According to our analyses, canine heartworm infection in urban temperate Argentina could be described as relatively low, endemic, and spatially heterogeneous. Host and environmental factors affecting heartworm transmission at local level were identified and discussed. © 2010 Elsevier B.V. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03044017_v176_n2-3_p240_Vezzani http://hdl.handle.net/20.500.12110/paper_03044017_v176_n2-3_p240_Vezzani |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Argentina Dirofilaria immitis Dogs Heartworm prevalence Nematodes Spatial analysis age article blood sampling Dirofilaria immitis dirofilariasis dog environmental factor epidemiological data geographic distribution host susceptibility infection risk male nonhuman parasite prevalence parasite transmission population density soil property South America trend study Animals Argentina Dirofilaria immitis Dirofilariasis Dog Diseases Dogs Female Male Risk Factors Time Factors Canis familiaris Dirofilaria immitis Nematoda |
| spellingShingle |
Argentina Dirofilaria immitis Dogs Heartworm prevalence Nematodes Spatial analysis age article blood sampling Dirofilaria immitis dirofilariasis dog environmental factor epidemiological data geographic distribution host susceptibility infection risk male nonhuman parasite prevalence parasite transmission population density soil property South America trend study Animals Argentina Dirofilaria immitis Dirofilariasis Dog Diseases Dogs Female Male Risk Factors Time Factors Canis familiaris Dirofilaria immitis Nematoda Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns |
| topic_facet |
Argentina Dirofilaria immitis Dogs Heartworm prevalence Nematodes Spatial analysis age article blood sampling Dirofilaria immitis dirofilariasis dog environmental factor epidemiological data geographic distribution host susceptibility infection risk male nonhuman parasite prevalence parasite transmission population density soil property South America trend study Animals Argentina Dirofilaria immitis Dirofilariasis Dog Diseases Dogs Female Male Risk Factors Time Factors Canis familiaris Dirofilaria immitis Nematoda |
| description |
This study was aimed at understanding some aspects of the canine heartworm epidemiology in the southern distribution limit of the parasite in South America. With this objective, 19,298 blood samples of owned dogs from 65 localities of 13 municipalities of Buenos Aires Province were tested for Dirofilaria immitis circulating microfilariae and/or female antigens. The overall heartworm prevalence was 1.63% by microhematocrit tube technique (n = 19,136), 3.65% by modified Knott (n = 713), and 14.41% by antigen test kit (n = 118). Microfilaremic dogs showed a median of 1933 microfilariae per millilitre (q1 = 375, q3 = 5625, n = 100). Male dogs belonging to breeds of short hair and large size recorded significantly higher prevalences than the other categories. Also, the prevalence increased significantly with the age and only dogs younger than 12 months were not found infected. A clear decreasing trend of the annual prevalence was observed during the whole study period, from 3.91% in 2001 to 1.17% in 2006. D. immitis-infected dogs were detected in 32 localities of 9 municipalities (prevalence range: 0.2-6.7%). Generalized linear models were used to assess associations between heartworm prevalence and environmental variables. The resulting significant models were univariate and included variables related with soil cover and human population density. The best model predicted maximum heartworm prevalences around middle values of bare soil cover, and lower at high and low covers. According to our analyses, canine heartworm infection in urban temperate Argentina could be described as relatively low, endemic, and spatially heterogeneous. Host and environmental factors affecting heartworm transmission at local level were identified and discussed. © 2010 Elsevier B.V. |
| title |
Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns |
| title_short |
Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns |
| title_full |
Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns |
| title_fullStr |
Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns |
| title_full_unstemmed |
Epidemiology of canine heartworm in its southern distribution limit in South America: Risk factors, inter-annual trend and spatial patterns |
| title_sort |
epidemiology of canine heartworm in its southern distribution limit in south america: risk factors, inter-annual trend and spatial patterns |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03044017_v176_n2-3_p240_Vezzani http://hdl.handle.net/20.500.12110/paper_03044017_v176_n2-3_p240_Vezzani |
| _version_ |
1768543515634040832 |