Habitat Characteristics For Immature Stages of Aedes aegypti In Zanzibar City, Tanzania

Fatma Saleh; Jovin Kitau; Flemming Konradsen; Michael Alifrangis; Chia-hsien Lin; Salim Juma; Salum Seif Mchenga; Thabit Saadaty; Karin Linda Schiøler

doi:10.2987/17-6709.1

Habitat Characteristics For Immature Stages of Aedes aegypti In Zanzibar City, Tanzania

Fatma Saleh, Jovin Kitau, Flemming Konradsen, Michael Alifrangis, Chia-hsien Lin, Salim Juma, Salum Seif Mchenga, Thabit Saadaty, Karin Linda Schiøler

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Abstract

Aedes aegypti is the main vector for dengue, chikungunya, yellow fever, Zika, and other arboviruses of public health importance. The presence of Ae. aegypti has never been systematically assessed in Zanzibar, including its preferred larval habitats. In 2016 we conducted a cross-sectional entomological survey to describe the preferred larval habitats of Ae. aegypti in Zanzibar City, the main urban area of the Zanzibar archipelago. The surveys for container habitats were conducted for a 17-wk period beginning in January 2016. Immature stages (larvae and pupae) were collected, reared to adulthood, and identified to species. The positive and potential habitats were categorized on the basis of physical, biological, and chemical parameters. A total of 200 samples were collected, of which 124 (62.0%) were positive for immature stages of mosquitoes and 114 (92%) for Ae. aegypti larvae and pupae. Presence of vegetation (odds ratio [OR] = 2.11, 95% confidence interval [CI] = 1.19-3.74), organic matter (OR = 2.37, 95% CI = 1.21-4.60), inorganic matter (OR = 1.78, 95% CI = 1.01-3.13), and sun exposure (OR = 2.34, 95% CI = 1.24-4.36) were all significantly associated with the presence of immature stages of Ae. aegypti, suggesting that these conditions promote colonization of containers. Plastic containers supported 64% of the immature stages and produced approximately 50% of the pupae. Although immature counts were the highest in discarded artifacts, higher pupal counts were found in domestic water storage containers. Our observations suggest that effective control of Ae. aegypti in Zanzibar City must include improved solid waste management (collection and proper disposal of potential container habitats) and reliable supply of domestic water to minimize water-storing practices that provide larval habitats for Ae. aegypti.

Original language	English
Journal	Journal of the American Mosquito Control Association
Volume	34
Issue number	3
Pages (from-to)	190-200
ISSN	8756-971X
DOIs	https://doi.org/10.2987/17-6709.1
Publication status	Published - 1 Sept 2018

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title = "Habitat Characteristics For Immature Stages of Aedes aegypti In Zanzibar City, Tanzania",

abstract = "Aedes aegypti is the main vector for dengue, chikungunya, yellow fever, Zika, and other arboviruses of public health importance. The presence of Ae. aegypti has never been systematically assessed in Zanzibar, including its preferred larval habitats. In 2016 we conducted a cross-sectional entomological survey to describe the preferred larval habitats of Ae. aegypti in Zanzibar City, the main urban area of the Zanzibar archipelago. The surveys for container habitats were conducted for a 17-wk period beginning in January 2016. Immature stages (larvae and pupae) were collected, reared to adulthood, and identified to species. The positive and potential habitats were categorized on the basis of physical, biological, and chemical parameters. A total of 200 samples were collected, of which 124 (62.0%) were positive for immature stages of mosquitoes and 114 (92%) for Ae. aegypti larvae and pupae. Presence of vegetation (odds ratio [OR] = 2.11, 95% confidence interval [CI] = 1.19-3.74), organic matter (OR = 2.37, 95% CI = 1.21-4.60), inorganic matter (OR = 1.78, 95% CI = 1.01-3.13), and sun exposure (OR = 2.34, 95% CI = 1.24-4.36) were all significantly associated with the presence of immature stages of Ae. aegypti, suggesting that these conditions promote colonization of containers. Plastic containers supported 64% of the immature stages and produced approximately 50% of the pupae. Although immature counts were the highest in discarded artifacts, higher pupal counts were found in domestic water storage containers. Our observations suggest that effective control of Ae. aegypti in Zanzibar City must include improved solid waste management (collection and proper disposal of potential container habitats) and reliable supply of domestic water to minimize water-storing practices that provide larval habitats for Ae. aegypti.",

author = "Fatma Saleh and Jovin Kitau and Flemming Konradsen and Michael Alifrangis and Chia-hsien Lin and Salim Juma and Mchenga, {Salum Seif} and Thabit Saadaty and Schi{\o}ler, {Karin Linda}",

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doi = "10.2987/17-6709.1",

language = "English",

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T1 - Habitat Characteristics For Immature Stages of Aedes aegypti In Zanzibar City, Tanzania

AU - Saleh, Fatma

AU - Kitau, Jovin

AU - Konradsen, Flemming

AU - Alifrangis, Michael

AU - Lin, Chia-hsien

AU - Juma, Salim

AU - Mchenga, Salum Seif

AU - Saadaty, Thabit

AU - Schiøler, Karin Linda

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Aedes aegypti is the main vector for dengue, chikungunya, yellow fever, Zika, and other arboviruses of public health importance. The presence of Ae. aegypti has never been systematically assessed in Zanzibar, including its preferred larval habitats. In 2016 we conducted a cross-sectional entomological survey to describe the preferred larval habitats of Ae. aegypti in Zanzibar City, the main urban area of the Zanzibar archipelago. The surveys for container habitats were conducted for a 17-wk period beginning in January 2016. Immature stages (larvae and pupae) were collected, reared to adulthood, and identified to species. The positive and potential habitats were categorized on the basis of physical, biological, and chemical parameters. A total of 200 samples were collected, of which 124 (62.0%) were positive for immature stages of mosquitoes and 114 (92%) for Ae. aegypti larvae and pupae. Presence of vegetation (odds ratio [OR] = 2.11, 95% confidence interval [CI] = 1.19-3.74), organic matter (OR = 2.37, 95% CI = 1.21-4.60), inorganic matter (OR = 1.78, 95% CI = 1.01-3.13), and sun exposure (OR = 2.34, 95% CI = 1.24-4.36) were all significantly associated with the presence of immature stages of Ae. aegypti, suggesting that these conditions promote colonization of containers. Plastic containers supported 64% of the immature stages and produced approximately 50% of the pupae. Although immature counts were the highest in discarded artifacts, higher pupal counts were found in domestic water storage containers. Our observations suggest that effective control of Ae. aegypti in Zanzibar City must include improved solid waste management (collection and proper disposal of potential container habitats) and reliable supply of domestic water to minimize water-storing practices that provide larval habitats for Ae. aegypti.

AB - Aedes aegypti is the main vector for dengue, chikungunya, yellow fever, Zika, and other arboviruses of public health importance. The presence of Ae. aegypti has never been systematically assessed in Zanzibar, including its preferred larval habitats. In 2016 we conducted a cross-sectional entomological survey to describe the preferred larval habitats of Ae. aegypti in Zanzibar City, the main urban area of the Zanzibar archipelago. The surveys for container habitats were conducted for a 17-wk period beginning in January 2016. Immature stages (larvae and pupae) were collected, reared to adulthood, and identified to species. The positive and potential habitats were categorized on the basis of physical, biological, and chemical parameters. A total of 200 samples were collected, of which 124 (62.0%) were positive for immature stages of mosquitoes and 114 (92%) for Ae. aegypti larvae and pupae. Presence of vegetation (odds ratio [OR] = 2.11, 95% confidence interval [CI] = 1.19-3.74), organic matter (OR = 2.37, 95% CI = 1.21-4.60), inorganic matter (OR = 1.78, 95% CI = 1.01-3.13), and sun exposure (OR = 2.34, 95% CI = 1.24-4.36) were all significantly associated with the presence of immature stages of Ae. aegypti, suggesting that these conditions promote colonization of containers. Plastic containers supported 64% of the immature stages and produced approximately 50% of the pupae. Although immature counts were the highest in discarded artifacts, higher pupal counts were found in domestic water storage containers. Our observations suggest that effective control of Ae. aegypti in Zanzibar City must include improved solid waste management (collection and proper disposal of potential container habitats) and reliable supply of domestic water to minimize water-storing practices that provide larval habitats for Ae. aegypti.

U2 - 10.2987/17-6709.1

DO - 10.2987/17-6709.1

M3 - Journal article

C2 - 31442169

SN - 1046-3607

VL - 34

SP - 190

EP - 200

JO - Mosquito News

JF - Mosquito News

IS - 3

ER -

Habitat Characteristics For Immature Stages of Aedes aegypti In Zanzibar City, Tanzania

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