Transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density
1. The transmission of insect pathogens cannot be adequately described by direct linear functions of host and pathogen density due to heterogeneity generated from behavioural or physiological traits, or from the spatial distribution of pathogen particles. Invertebrate iridescent viruses (IIVs) can cause patent and lethal infection or a covert sub-lethal infection in insects. Aedes aegypti larvae were exposed to suspensions of IIV type 6 at two densities. High larval density increased the prevalence of aggression resulting in potentially fatal wounding. 2. The overall prevalence of infection (patent + covert) was positively influenced by host density and increased with exposure time in both densities. The survival time of patently infected insects was extended by ≈ 5 days compared with non-infected insects. 3. Maximum likelihood models based on the binomial distribution were fitted to empirical results. A model incorporating heterogeneity in host susceptibility by inclusion of a pathogen-free refuge was a significantly better fit to data than an all-susceptible model, indicating that transmission is non-linear. The transmission coefficient (υ) did not differ with host density whereas the faction of the population that occupied the pathogen-free refuge (ΠR) was significantly reduced at high host density compared with the low density treatment. 4. The transmission of free-living infective stages of an IIV in Ae. aegypti larvae is non-linear, probably because of density-related changes in the frequency of aggressive encounters between hosts. This alters host susceptibility to infection and effectively reduces the proportion of hosts that occupy the pathogen-free refuge.
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Subjects: | Iridovirus, Culicidae, Patógenos de insectos, Infección, Aedes aegypti, Artfrosur, |
Online Access: | https://doi.org/10.1111/j.0307-6946.2005.00711.x |
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KOHA-OAI-ECOSUR:473082024-03-12T13:03:14ZTransmission dynamics of an iridescent virus in an experimental mosquito population the role of host density Marina Fernández, Carlos Félix Doctor autor 14468 Fernández Salas, Ildefonso autor 14469 Ibarra, Jorge E. Doctor autor 12530 Arredondo Jiménez, Juan Ignacio Doctor autor 14654 Valle Mora, Javier Francisco Maestro autor 10513 Williams, Trevor Doctor autor 5446 texteng1. The transmission of insect pathogens cannot be adequately described by direct linear functions of host and pathogen density due to heterogeneity generated from behavioural or physiological traits, or from the spatial distribution of pathogen particles. Invertebrate iridescent viruses (IIVs) can cause patent and lethal infection or a covert sub-lethal infection in insects. Aedes aegypti larvae were exposed to suspensions of IIV type 6 at two densities. High larval density increased the prevalence of aggression resulting in potentially fatal wounding. 2. The overall prevalence of infection (patent + covert) was positively influenced by host density and increased with exposure time in both densities. The survival time of patently infected insects was extended by ≈ 5 days compared with non-infected insects. 3. Maximum likelihood models based on the binomial distribution were fitted to empirical results. A model incorporating heterogeneity in host susceptibility by inclusion of a pathogen-free refuge was a significantly better fit to data than an all-susceptible model, indicating that transmission is non-linear. The transmission coefficient (υ) did not differ with host density whereas the faction of the population that occupied the pathogen-free refuge (ΠR) was significantly reduced at high host density compared with the low density treatment. 4. The transmission of free-living infective stages of an IIV in Ae. aegypti larvae is non-linear, probably because of density-related changes in the frequency of aggressive encounters between hosts. This alters host susceptibility to infection and effectively reduces the proportion of hosts that occupy the pathogen-free refuge.1. The transmission of insect pathogens cannot be adequately described by direct linear functions of host and pathogen density due to heterogeneity generated from behavioural or physiological traits, or from the spatial distribution of pathogen particles. Invertebrate iridescent viruses (IIVs) can cause patent and lethal infection or a covert sub-lethal infection in insects. Aedes aegypti larvae were exposed to suspensions of IIV type 6 at two densities. High larval density increased the prevalence of aggression resulting in potentially fatal wounding. 2. The overall prevalence of infection (patent + covert) was positively influenced by host density and increased with exposure time in both densities. The survival time of patently infected insects was extended by ≈ 5 days compared with non-infected insects. 3. Maximum likelihood models based on the binomial distribution were fitted to empirical results. A model incorporating heterogeneity in host susceptibility by inclusion of a pathogen-free refuge was a significantly better fit to data than an all-susceptible model, indicating that transmission is non-linear. The transmission coefficient (υ) did not differ with host density whereas the faction of the population that occupied the pathogen-free refuge (ΠR) was significantly reduced at high host density compared with the low density treatment. 4. The transmission of free-living infective stages of an IIV in Ae. aegypti larvae is non-linear, probably because of density-related changes in the frequency of aggressive encounters between hosts. This alters host susceptibility to infection and effectively reduces the proportion of hosts that occupy the pathogen-free refuge.IridovirusCulicidaePatógenos de insectosInfecciónAedes aegyptiArtfrosurEcological Entomologyhttps://doi.org/10.1111/j.0307-6946.2005.00711.xDisponible para usuarios de ECOSUR con su clave de acceso |
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Iridovirus Culicidae Patógenos de insectos Infección Aedes aegypti Artfrosur Iridovirus Culicidae Patógenos de insectos Infección Aedes aegypti Artfrosur |
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Iridovirus Culicidae Patógenos de insectos Infección Aedes aegypti Artfrosur Iridovirus Culicidae Patógenos de insectos Infección Aedes aegypti Artfrosur Marina Fernández, Carlos Félix Doctor autor 14468 Fernández Salas, Ildefonso autor 14469 Ibarra, Jorge E. Doctor autor 12530 Arredondo Jiménez, Juan Ignacio Doctor autor 14654 Valle Mora, Javier Francisco Maestro autor 10513 Williams, Trevor Doctor autor 5446 Transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density |
description |
1. The transmission of insect pathogens cannot be adequately described by direct linear functions of host and pathogen density due to heterogeneity generated from behavioural or physiological traits, or from the spatial distribution of pathogen particles. Invertebrate iridescent viruses (IIVs) can cause patent and lethal infection or a covert sub-lethal infection in insects. Aedes aegypti larvae were exposed to suspensions of IIV type 6 at two densities. High larval density increased the prevalence of aggression resulting in potentially fatal wounding. 2. The overall prevalence of infection (patent + covert) was positively influenced by host density and increased with exposure time in both densities. The survival time of patently infected insects was extended by ≈ 5 days compared with non-infected insects. 3. Maximum likelihood models based on the binomial distribution were fitted to empirical results. A model incorporating heterogeneity in host susceptibility by inclusion of a pathogen-free refuge was a significantly better fit to data than an all-susceptible model, indicating that transmission is non-linear. The transmission coefficient (υ) did not differ with host density whereas the faction of the population that occupied the pathogen-free refuge (ΠR) was significantly reduced at high host density compared with the low density treatment. 4. The transmission of free-living infective stages of an IIV in Ae. aegypti larvae is non-linear, probably because of density-related changes in the frequency of aggressive encounters between hosts. This alters host susceptibility to infection and effectively reduces the proportion of hosts that occupy the pathogen-free refuge. |
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Texto |
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Iridovirus Culicidae Patógenos de insectos Infección Aedes aegypti Artfrosur |
author |
Marina Fernández, Carlos Félix Doctor autor 14468 Fernández Salas, Ildefonso autor 14469 Ibarra, Jorge E. Doctor autor 12530 Arredondo Jiménez, Juan Ignacio Doctor autor 14654 Valle Mora, Javier Francisco Maestro autor 10513 Williams, Trevor Doctor autor 5446 |
author_facet |
Marina Fernández, Carlos Félix Doctor autor 14468 Fernández Salas, Ildefonso autor 14469 Ibarra, Jorge E. Doctor autor 12530 Arredondo Jiménez, Juan Ignacio Doctor autor 14654 Valle Mora, Javier Francisco Maestro autor 10513 Williams, Trevor Doctor autor 5446 |
author_sort |
Marina Fernández, Carlos Félix Doctor autor 14468 |
title |
Transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density |
title_short |
Transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density |
title_full |
Transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density |
title_fullStr |
Transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density |
title_full_unstemmed |
Transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density |
title_sort |
transmission dynamics of an iridescent virus in an experimental mosquito population the role of host density |
url |
https://doi.org/10.1111/j.0307-6946.2005.00711.x |
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