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Reviewing estimates of the basic reproduction number for dengue, Zika and chikungunya across global climate zones
Umeå universitet, Medicinska fakulteten, Institutionen för folkhälsa och klinisk medicin, Avdelningen för hållbar hälsa. School of International Business, Xiamen University Tan Kah Kee College, Zhangzhou, 363105, China..
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2020 (Engelska)Ingår i: Environmental Research, ISSN 0013-9351, E-ISSN 1096-0953, Vol. 182, artikel-id 109114Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

BACKGROUND: Globally, dengue, Zika virus, and chikungunya are important viral mosquito-borne diseases that infect millions of people annually. Their geographic range includes not only tropical areas but also sub-tropical and temperate zones such as Japan and Italy. The relative severity of these arboviral disease outbreaks can vary depending on the setting. In this study we explore variation in the epidemiologic potential of outbreaks amongst these climatic zones and arboviruses in order to elucidate potential reasons behind such differences.

METHODOLOGY: We reviewed the peer-reviewed literature (PubMed) to obtain basic reproduction number (R0) estimates for dengue, Zika virus, and chikungunya from tropical, sub-tropical and temperate regions. We also computed R0 estimates for temperate and sub-tropical climate zones, based on the outbreak curves in the initial outbreak phase. Lastly we compared these estimates across climate zones, defined by latitude.

RESULTS: Of 2115 studies, we reviewed the full text of 128 studies and included 65 studies in our analysis. Our results suggest that the R0 of an arboviral outbreak depends on climate zone, with lower R0 estimates, on average, in temperate zones (R0 = 2.03) compared to tropical (R0 = 3.44) and sub-tropical zones (R0 = 10.29). The variation in R0 was considerable, ranging from 0.16 to 65. The largest R0 was for dengue (65) and was estimated by the Ross-Macdonald model in the tropical zone, whereas the smallest R0 (0.16) was for Zika virus and was estimated statistically from an outbreak curve in the sub-tropical zone.

CONCLUSIONS: The results indicate climate zone to be an important determinant of the basic reproduction number, R0, for dengue, Zika virus, and chikungunya. The role of other factors as determinants of R0, such as methods, environmental and social conditions, and disease control, should be further investigated. The results suggest that R0 may increase in temperate regions in response to global warming, and highlight the increasing need for strengthening preparedness and control activities.

Ort, förlag, år, upplaga, sidor
Elsevier, 2020. Vol. 182, artikel-id 109114
Nyckelord [en]
Aedes aegypti, Aedes albopictus, Arbovirus, Basic reproduction number, Chikungunya, Climate, Dengue, R(0), Zika virus
Nationell ämneskategori
Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi
Identifikatorer
URN: urn:nbn:se:umu:diva-167808DOI: 10.1016/j.envres.2020.109114ISI: 000516094400103PubMedID: 31927301OAI: oai:DiVA.org:umu-167808DiVA, id: diva2:1391385
Forskningsfinansiär
Vetenskapsrådet, 2018-01754Forskningsrådet Formas, 2017-01300Tillgänglig från: 2020-02-04 Skapad: 2020-02-04 Senast uppdaterad: 2020-05-27Bibliografiskt granskad

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Liu, YingQuam, Mikkel B. M.Rocklöv, Joacim

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