Abstract:
BACKGROUND:Persistent covert infections of the myxozoan, Tetracapsuloides bryosalmonae, in primary invertebrate hosts (the freshwater bryozoan, Fredericella sultana) have been proposed to represent a reservoir for proliferative kidney disease in secondary fish hosts. However, we have limited understanding of how covert infections persist and vary in bryozoan populations over time and space and how they may impact these populations. In addition, previous studies have likely underestimated covert infection prevalence. To improve our understanding of the dynamics, impacts and implications of covert infections we employed a highly sensitive polymerase chain reaction (PCR) assay and undertook the first investigation of covert infections in the field over an annual period by sampling bryozoans every 45 days from three populations within each of three rivers. RESULTS:Covert infections persisted throughout the year and prevalence varied within and between rivers, but were often > 50%. Variation in temperature and water chemistry were linked with changes in prevalence in a manner consistent with the maintenance of covert infections during periods of low productivity and thus poor growth conditions for both bryozoans and T. bryosalmonae. The presence and increased severity of covert infections reduced host growth but only when bryozoans were also investing in the production of overwintering propagules (statoblasts). However, because statoblast production is transitory, this effect is unlikely to greatly impact the capacity of bryozoan populations to act as persistent sources of infections and hence potential disease outbreaks in farmed and wild fish populations. CONCLUSIONS:We demonstrate that covert infections are widespread and persist over space and time in bryozoan populations. To our knowledge, this is the first long-term study of covert infections in a field setting. Review of the results of this and previous studies enables us to identify key questions related to the ecology and evolution of covert infection strategies and associated host-parasite interactions.
journal_name
Parasit Vectorsjournal_title
Parasites & vectorsauthors
Fontes I,Hartikainen H,Williams C,Okamura Bdoi
10.1186/s13071-017-2495-8subject
Has Abstractpub_date
2017-11-02 00:00:00pages
542issue
1issn
1756-3305pii
10.1186/s13071-017-2495-8journal_volume
10pub_type
杂志文章abstract::Control and eventual elimination of human parasitic diseases in the People's Republic of China (P.R. China) requires novel approaches, particularly in the areas of diagnostics, mathematical modelling, monitoring, evaluation, surveillance and public health response. A comprehensive effort, involving the collaboration o...
journal_title:Parasites & vectors
pub_type: 杂志文章,评审
doi:10.1186/1756-3305-5-221
更新日期:2012-10-04 00:00:00
abstract:BACKGROUND:Transfer RNA (tRNA)-derived fragments (tRFs) have been widely identified in nature, functioning in diverse biological and pathological situations. Yet, the presence of these small RNAs in Plasmodium spp. remains unknown. Systematic identification and characterization of tRFs is therefore highly needed to und...
journal_title:Parasites & vectors
pub_type: 杂志文章
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journal_title:Parasites & vectors
pub_type: 杂志文章
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2016-05-31 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2012-10-31 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2011-03-08 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2017-08-09 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2016-06-27 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2017-11-03 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-016-1756-2
更新日期:2016-08-23 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-4-149
更新日期:2011-07-27 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-020-04226-8
更新日期:2020-07-24 00:00:00
abstract::In Italy, dogs and cats are at risk of becoming infected by different vector-borne pathogens, including protozoa, bacteria, and helminths. Ticks, fleas, phlebotomine sand flies, and mosquitoes are recognized vectors of pathogens affecting cats and dogs, some of which (e.g., Anaplasma phagocytophilum, Borrelia burgdorf...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-3-2
更新日期:2010-01-11 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3401-3
更新日期:2019-03-25 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-5-215
更新日期:2012-09-28 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-018-3199-4
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journal_title:Parasites & vectors
pub_type: 杂志文章,随机对照试验
doi:10.1186/s13071-015-0775-8
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journal_title:Parasites & vectors
pub_type: 杂志文章
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3366-2
更新日期:2019-03-25 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2066-z
更新日期:2017-03-06 00:00:00
abstract:BACKGROUND:The East Route Project (ERP) of the South-to-North Water Diversion Project (SNWDP) stretches across schistosomiasis endemic and non-endemic areas in China, which may lead to the dispersal of Oncomelania hupensis, the intermediate host of Schistosoma japonicum, from permissive areas along the Yangtze River Ba...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-020-4004-8
更新日期:2020-03-19 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-6-13
更新日期:2013-01-16 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2565-y
更新日期:2017-12-19 00:00:00
abstract:BACKGROUND:The population dynamics of vector-borne pathogens inside the arthropod vector can have important consequences for vector-to-host transmission. Tick-borne spirochete bacteria of the Borrelia burgdorferi (sensu lato) species complex cause Lyme borreliosis in humans and spend long periods of time (>12 months) i...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2187-4
更新日期:2017-05-25 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3611-8
更新日期:2019-09-16 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-016-1683-2
更新日期:2016-07-25 00:00:00
abstract:BACKGROUND:Entomopathogenic fungi are potential candidates for use in integrated vector management and many isolates are compatible with synthetic and natural insecticides. Neem oil was tested separately and in combination with the entomopathogenic fungus Metarhizium anisopliae against larvae of the dengue vector Aedes...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-1280-9
更新日期:2015-12-30 00:00:00
abstract:BACKGROUND:Limited available sequence information has greatly impeded population genetics, phylogenetics and systematics studies in the subclass Acari (mites and ticks). Mitochondrial (mt) DNA is well known to provide genetic markers for investigations in these areas, but complete mt genomic data have been lacking for ...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-7-340
更新日期:2014-07-22 00:00:00
abstract:BACKGROUND:Hemotropic mycoplasmas are epicellular erythrocytic bacteria that can cause infectious anemia in some mammalian species. Worldwide, hemotropic mycoplasmas are emerging or re-emerging zoonotic pathogens potentially causing serious and significant health problems in wildlife. The objective of this study was to...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-7-117
更新日期:2014-03-24 00:00:00