Evidence map›Paper›PMID 30696441›Full record

ArticleMalaria journal2019

Swarms of the malaria vector Anopheles funestus in Tanzania.

Emmanuel W Kaindoa, Halfan S Ngowo, Alex J Limwagu, Magellan Tchouakui, Emmanuel Hape, Said Abbasi, Japhet Kihonda, Arnold S Mmbando, Rukiyah M Njalambaha, Gustav Mkandawile and 3 more

Open access · goldAbstract read
In one paragraph

Article in Malaria journal, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed
7.8field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

25 citing papers in PubMed, 50 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

13 authors at 3 institutions in 4 countries.

Emmanuel W KaindoaEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania. ekaindoa@ihi.or.tz.ORCID http://orcid.org/0000-0001-6170-5694
Halfan S NgowoEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Alex J LimwaguEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Magellan TchouakuiCentre for Research in Infectious Diseases (CRID), P.O. BOX 13591, Yaoundé, Cameroon.
Emmanuel HapeEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Said AbbasiEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Japhet KihondaEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Arnold S MmbandoEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Rukiyah M NjalambahaEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Gustav MkandawileEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Hamis BwanaryEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Maureen CoetzeeSchool of Pathology, Faculty of Health Sciences, Wits Research Institute for Malaria and Wits/MRC Collaborating Centre for Multidisciplinary Research on Malaria, University of the Witwatersrand, Johannesburg, South Africa.
Fredros O OkumuEnvironmental Health and Ecological Science Department, Ifakara Health Institute, P. O. Box 53, Ifakara, Tanzania.
Ifakara Health Institute · TZMinistry of Scientific Research and Innovation · CMUniversity of the Witwatersrand · ZA

Funding

Bill & Melinda Gates Foundation OPP1177156Consortium for Advanced Research Training in Africa 107768/Z/15/ZDST/NRF South African Research Chairs Initiative 64763Howard Hughes Medical Institute (US) OPP1175877Innovative Vector Control Consortium (IVCC) No: 43Wellcome TrustWellcome Trust Intermediate Fellowship in Public Health and Tropical Medicine WT102350/Z/13Wellcome Trust Masters Fellowship in Public Health and Tropical Medicine 106356/Z/14/Z
6 · The paper itself

Abstract

backgroundAnopheles funestus mosquitoes currently contribute more than 85% of ongoing malaria transmission events in south-eastern Tanzania, even though they occur in lower densities than other vectors, such as Anopheles arabiensis. Unfortunately, the species ecology is minimally understood, partly because of difficulties in laboratory colonization. This study describes the first observations of An. funestus swarms in Tanzania, possibly heralding new opportunities for control.

methodUsing systematic searches by community-based volunteers and expert entomologists, An. funestus swarms were identified in two villages in Ulanga and Kilombero districts in south-eastern Tanzania, starting June 2018. Swarms were characterized by size, height, start- and end-times, presence of copulation and associated environmental features. Samples of male mosquitoes from the swarms were examined for sexual maturity by observing genitalia rotation, species identity using polymerase chain reaction and wing sizes.

results581 An. funestus (98.1% males (n = 570) and 1.9% (n = 11) females) and 9 Anopheles gambiae sensu lato (s.l.) males were sampled using sweep nets from the 81 confirmed swarms in two villages (Ikwambi in Kilombero district and Tulizamoyo in Ulanga district). Six copulation events were observed in the swarms. Mean density (95% CL) of An. funestus caught/swarm/village/evening was 6.6 (5.9-7.2) in Tulizamoyo and 10.8 (5.8-15.8) in Ikwambi. 87.7% (n = 71) of the swarms were found in Tulizamoyo, while 12.3% (n = 10) were in Ikwambi. Mean height of swarms was 1.7 m (0.9-2.5 m), while mean duration was 12.9 (7.9-17.9) minutes. The PCR analysis confirmed that 100% of all An. funestus s.l. samples processed were An. funestus sensu stricto. Mean wing length of An. funestus males was 2.47 mm (2.0-2.8 mm), but there was no difference between swarming males and indoor-resting males. Most swarms (95.0%) occurred above bare ground, sometime on front lawns near human dwellings, and repeatedly in the same locations.

conclusionThis study has demonstrated occurrence of An. funestus swarms for the first time in Tanzania. Further investigations could identify new opportunities for improved control of this dominant malaria vector, possibly by targeting the swarms.

Indexed as

AnimalsAnophelesFemaleMaleMosquito VectorsPopulation DynamicsSocial BehaviorTanzania

Identifiers

PMID30696441
PMCPMC6350364
OpenAlexW2943988783

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.