Prevalence of Trypanosoma and Sodalis in wild populations of tsetse flies and their impact on sterile insect technique programmes for tsetse eradication
The sterile insect technique (SIT) is an environment friendly and sustainable method to manage insect pests of economic importance through successive releases of sterile irradiated males of the targeted species to a defined area. A mating of a sterile male with a virgin wild female will result in no...
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Published in | Scientific reports Vol. 12; no. 1; p. 3322 |
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Main Authors | , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
28.02.2022
Nature Publishing Group Nature Portfolio |
Subjects | |
Online Access | Get full text |
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Summary: | The sterile insect technique (SIT) is an environment friendly and sustainable method to manage insect pests of economic importance through successive releases of sterile irradiated males of the targeted species to a defined area. A mating of a sterile male with a virgin wild female will result in no offspring, and ultimately lead to the suppression or eradication of the targeted population. Tsetse flies, vectors of African
Trypanosoma,
have a highly regulated and defined microbial fauna composed of three bacterial symbionts that may have a role to play in the establishment of
Trypanosoma
infections in the flies and hence, may influence the vectorial competence of the released sterile males.
Sodalis
bacteria seem to interact with
Trypanosoma
infection in tsetse flies. Field-caught tsetse flies of ten different taxa and from 15 countries were screened using PCR to detect the presence of
Sodalis
and
Trypanosoma
species and analyse their interaction. The results indicate that the prevalence of
Sodalis
and
Trypanosoma
varied with country and tsetse species. Trypanosome prevalence was higher in east, central and southern African countries than in west African countries. Tsetse fly infection rates with
Trypanosoma vivax
and
T. brucei
sspp were higher in west African countries, whereas tsetse infection with
T. congolense
and
T. simiae, T. simiae
(
tsavo
) and
T. godfreyi
were higher in east, central and south African countries.
Sodalis
prevalence was high in
Glossina morsitans morsitans
and
G. pallidipes
but absent in
G. tachinoides.
Double and triple infections with
Trypanosoma
taxa and coinfection of
Sodalis
and
Trypanosoma
were rarely observed but it occurs in some taxa and locations. A significant Chi square value (< 0.05) seems to suggest that
Sodalis
and
Trypanosoma
infection correlate in
G. palpalis gambiensis
,
G. pallidipes
and
G. medicorum
.
Trypanosoma
infection seemed significantly associated with an increased density of
Sodalis
in wild
G. m. morsitans
and
G. pallidipes
flies, however, there was no significant impact of
Sodalis
infection on trypanosome density. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-022-06699-2 |