Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries.
Background Fish-borne zoonotic trematodes (FZT) are a food safety and health concern in Vietnam. Humans and other final hosts acquire these parasites from eating raw or under-cooked fish with FZT metacercariae. Fish raised in ponds are exposed to cercariae shed by snail hosts that are common in fish...
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ftdoajarticles:oai:doaj.org/article:f92dc14b252c4f719ce69f91abcfc785 2023-05-15T15:17:18+02:00 Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries. Jesper Hedegaard Clausen Henry Madsen K Darwin Murrell Van Phan Thi Hung Nguyen Manh Khue Nguyen Viet Anders Dalsgaard 2012-01-01T00:00:00Z https://doi.org/10.1371/journal.pntd.0001945 https://doaj.org/article/f92dc14b252c4f719ce69f91abcfc785 EN eng Public Library of Science (PLoS) https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23285303/?tool=EBI https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0001945 https://doaj.org/article/f92dc14b252c4f719ce69f91abcfc785 PLoS Neglected Tropical Diseases, Vol 6, Iss 12, p e1945 (2012) Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 article 2012 ftdoajarticles https://doi.org/10.1371/journal.pntd.0001945 2022-12-31T07:27:28Z Background Fish-borne zoonotic trematodes (FZT) are a food safety and health concern in Vietnam. Humans and other final hosts acquire these parasites from eating raw or under-cooked fish with FZT metacercariae. Fish raised in ponds are exposed to cercariae shed by snail hosts that are common in fish farm ponds. Previous risk assessment on FZT transmission in the Red River Delta of Vietnam identified carp nursery ponds as major sites of transmission. In this study, we analyzed the association between snail population density and heterophyid trematode infection in snails with the rate of FZT transmission to juvenile fish raised in carp nurseries. Methodology/principal findings Snail population density and prevalence of trematode (Heterophyidae) infections were determined in 48 carp nurseries producing Rohu juveniles, (Labeo rohita) in the Red River Delta area. Fish samples were examined at 3, 6 and 9 weeks after the juvenile fish were introduced into the ponds. There was a significant positive correlation between prevalence of FZT metacercariae in juvenile fish and density of infected snails. Thus, the odds of infection in juvenile fish were 4.36 and 11.32 times higher for ponds with medium and high density of snails, respectively, compared to ponds where no infected snails were found. Further, the intensity of fish FZT infections increased with the density of infected snails. Interestingly, however, some ponds with no or few infected snails were collected also had high prevalence and intensity of FZT in juvenile fish. This may be due to immigration of cercariae into the pond from external water sources. Conclusions/significance The total number and density of potential host snails and density of host snails infected with heterophyid trematodes in the aquaculture pond is a useful predictor for infections in juvenile fish, although infection levels in juvenile fish can occur despite low density or absence infected snails. This suggests that intervention programs to control FZT infection of fish should include not ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic PLoS Neglected Tropical Diseases 6 12 e1945 |
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Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
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Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 Jesper Hedegaard Clausen Henry Madsen K Darwin Murrell Van Phan Thi Hung Nguyen Manh Khue Nguyen Viet Anders Dalsgaard Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries. |
topic_facet |
Arctic medicine. Tropical medicine RC955-962 Public aspects of medicine RA1-1270 |
description |
Background Fish-borne zoonotic trematodes (FZT) are a food safety and health concern in Vietnam. Humans and other final hosts acquire these parasites from eating raw or under-cooked fish with FZT metacercariae. Fish raised in ponds are exposed to cercariae shed by snail hosts that are common in fish farm ponds. Previous risk assessment on FZT transmission in the Red River Delta of Vietnam identified carp nursery ponds as major sites of transmission. In this study, we analyzed the association between snail population density and heterophyid trematode infection in snails with the rate of FZT transmission to juvenile fish raised in carp nurseries. Methodology/principal findings Snail population density and prevalence of trematode (Heterophyidae) infections were determined in 48 carp nurseries producing Rohu juveniles, (Labeo rohita) in the Red River Delta area. Fish samples were examined at 3, 6 and 9 weeks after the juvenile fish were introduced into the ponds. There was a significant positive correlation between prevalence of FZT metacercariae in juvenile fish and density of infected snails. Thus, the odds of infection in juvenile fish were 4.36 and 11.32 times higher for ponds with medium and high density of snails, respectively, compared to ponds where no infected snails were found. Further, the intensity of fish FZT infections increased with the density of infected snails. Interestingly, however, some ponds with no or few infected snails were collected also had high prevalence and intensity of FZT in juvenile fish. This may be due to immigration of cercariae into the pond from external water sources. Conclusions/significance The total number and density of potential host snails and density of host snails infected with heterophyid trematodes in the aquaculture pond is a useful predictor for infections in juvenile fish, although infection levels in juvenile fish can occur despite low density or absence infected snails. This suggests that intervention programs to control FZT infection of fish should include not ... |
format |
Article in Journal/Newspaper |
author |
Jesper Hedegaard Clausen Henry Madsen K Darwin Murrell Van Phan Thi Hung Nguyen Manh Khue Nguyen Viet Anders Dalsgaard |
author_facet |
Jesper Hedegaard Clausen Henry Madsen K Darwin Murrell Van Phan Thi Hung Nguyen Manh Khue Nguyen Viet Anders Dalsgaard |
author_sort |
Jesper Hedegaard Clausen |
title |
Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries. |
title_short |
Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries. |
title_full |
Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries. |
title_fullStr |
Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries. |
title_full_unstemmed |
Relationship between snail population density and infection status of snails and fish with zoonotic trematodes in Vietnamese carp nurseries. |
title_sort |
relationship between snail population density and infection status of snails and fish with zoonotic trematodes in vietnamese carp nurseries. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2012 |
url |
https://doi.org/10.1371/journal.pntd.0001945 https://doaj.org/article/f92dc14b252c4f719ce69f91abcfc785 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
PLoS Neglected Tropical Diseases, Vol 6, Iss 12, p e1945 (2012) |
op_relation |
https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23285303/?tool=EBI https://doaj.org/toc/1935-2727 https://doaj.org/toc/1935-2735 1935-2727 1935-2735 doi:10.1371/journal.pntd.0001945 https://doaj.org/article/f92dc14b252c4f719ce69f91abcfc785 |
op_doi |
https://doi.org/10.1371/journal.pntd.0001945 |
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PLoS Neglected Tropical Diseases |
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6 |
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12 |
container_start_page |
e1945 |
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1766347558547881984 |