Abstract:
BACKGROUND:The World Health Organization (WHO) has set elimination (interruption of transmission) as an end goal for schistosomiasis. However, there is currently little guidance on the monitoring and evaluation strategy required once very low prevalence levels have been reached to determine whether elimination or resurgence of the disease will occur after stopping mass drug administration (MDA) treatment. METHODS:We employ a stochastic individual-based model of Schistosoma mansoni transmission and MDA impact to determine a prevalence threshold, i.e. prevalence of infection, which can be used to determine whether elimination or resurgence will occur after stopping treatment with a given probability. Simulations are run for treatment programmes with varying probabilities of achieving elimination and for settings where adults harbour low to high burdens of infection. Prevalence is measured based on using a single Kato-Katz on two samples per individual. We calculate positive predictive values (PPV) using PPV ≥ 0.9 as a reliable measure corresponding to ≥ 90% certainty of elimination. We analyse when post-treatment surveillance should be carried out to predict elimination. We also determine the number of individuals across a single community (of 500-1000 individuals) that should be sampled to predict elimination. RESULTS:We find that a prevalence threshold of 1% by single Kato-Katz on two samples per individual is optimal for predicting elimination at two years (or later) after the last round of MDA using a sample size of 200 individuals across the entire community (from all ages). This holds regardless of whether the adults have a low or high burden of infection relative to school-aged children. CONCLUSIONS:Using a prevalence threshold of 0.5% is sufficient for surveillance six months after the last round of MDA. However, as such a low prevalence can be difficult to measure in the field using Kato-Katz, we recommend using 1% two years after the last round of MDA. Higher prevalence thresholds of 2% or 5% can be used but require waiting over four years for post-treatment surveillance. Although, for treatment programmes where elimination is highly likely, these higher thresholds could be used sooner. Additionally, switching to more sensitive diagnostic techniques, will allow for a higher prevalence threshold to be employed.
journal_name
Parasit Vectorsjournal_title
Parasites & vectorsauthors
Toor J,Truscott JE,Werkman M,Turner HC,Phillips AE,King CH,Medley GF,Anderson RMdoi
10.1186/s13071-019-3611-8subject
Has Abstractpub_date
2019-09-16 00:00:00pages
437issue
1issn
1756-3305pii
10.1186/s13071-019-3611-8journal_volume
12pub_type
杂志文章abstract:BACKGROUND:The application of the sterile insect technique (SIT) requires mass-production of sterile males of good biological quality. The size of the project area will in most cases determine whether it is more cost effective to produce the sterile flies locally (and invest in a mass-rearing facility) or import the st...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-0869-3
更新日期:2015-05-01 00:00:00
abstract:BACKGROUND:The role of endemic murid rodents as hosts of arthropod vectors of diseases of medical and veterinary significance is well established in the northern hemisphere. In contrast, endemic murids are comparatively understudied as vector hosts in Africa, particularly in South Africa. Considering the great rodent d...
journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-7-366
更新日期:2014-08-15 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-1179-5
更新日期:2015-11-04 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-4-149
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-7-386
更新日期:2014-08-20 00:00:00
abstract:: Canine leishmaniosis is widespread in South America, where a number of Leishmania species have been isolated or molecularly characterised from dogs. Most cases of canine leishmaniosis are caused by Leishmania infantum (syn. Leishmania chagasi) and Leishmania braziliensis. The only well-established vector of Leishmani...
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/s13071-017-2407-y
更新日期:2017-10-24 00:00:00
abstract:BACKGROUND:The tropical bed bug, Cimex hemipterus, is a serious indoor public health pest in tropical regions causing intense physical discomfort and mental distress to humans. At present, the application of insecticides is the major control strategy. The present study was designed to evaluate the development of resist...
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
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abstract:BACKGROUND:Fleas are obligate blood-feeding ectoparasites and vectors of several bacterial zoonotic pathogens as well as trypanosomes that parasitize rodents and other small mammals. During investigations of tick- and rodent-borne diseases in Mali, West Africa, we included fleas and rodent-borne trypanosomes, both of w...
journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2016-10-11 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:2017-11-09 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:2015-02-24 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
doi:10.1186/1756-3305-6-241
更新日期:2013-08-20 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:2016-07-29 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2265-7
更新日期:2017-07-10 00:00:00
abstract:BACKGROUND:Host specificity is one of the outputs of the coevolution between parasites and their associated hosts. Several scenarios have been proposed to explain the pattern of parasite distribution in parental and hybrid genotypes ranging from hybrid resistance to hybrid susceptibility. We hypothesized that host-para...
journal_title:Parasites & vectors
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doi:10.1186/s13071-020-04271-3
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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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:2016-06-21 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-1-35
更新日期:2008-09-22 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-016-1954-y
更新日期:2017-01-16 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-017-2148-y
更新日期:2017-04-24 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:2019-01-09 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-020-04154-7
更新日期:2020-06-05 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-019-3875-z
更新日期:2020-01-08 00:00:00
abstract::Trypanosoma rangeli is a protozoan that is non-pathogenic for humans and other mammals but causes pathology in the genus Rhodnius. T. rangeli and R. prolixus is an excellent model for studying the parasite-vector interaction, but its cycle in invertebrates remains unclear. The vector becomes infected on ingesting bloo...
journal_title:Parasites & vectors
pub_type: 杂志文章,评审
doi:10.1186/1756-3305-5-105
更新日期:2012-05-30 00:00:00
abstract:BACKGROUND:Rhipicephalus microplus is a hard tick that has a major impact on cattle health in tropical and subtropical regions because it feeds on cattle and is implicated in the transmission of pathogens that cause diseases such as bovine anaplasmosis and babesiosis. Presently, acaricides are used to control tick infe...
journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2017-03-23 00:00:00