Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017
Objective: To explore the relationship between climate variables and enteric fever in the city of Ahmedabad and report preliminary findings regarding the influence of El Niño Southern Oscillations and Indian Ocean Dipole over enteric fever incidence. Method: A total of 29 808 Widal positive enteric...
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ftdoajarticles:oai:doaj.org/article:681e30365f5e4baebc1c03dbadad6f39 2023-05-15T15:12:34+02:00 Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017 Veena Iyer Susanna Abraham Cottagiri Ayushi Sharma Divya Nair Mehul S. Raval Bhavin Solanki Dileep Mavalankar 2019-01-01T00:00:00Z https://doi.org/10.4103/1995-7645.272485 https://doaj.org/article/681e30365f5e4baebc1c03dbadad6f39 EN eng Wolters Kluwer Medknow Publications http://www.apjtm.org/article.asp?issn=1995-7645;year=2019;volume=12;issue=12;spage=552;epage=558;aulast=Iyer https://doaj.org/toc/2352-4146 2352-4146 doi:10.4103/1995-7645.272485 https://doaj.org/article/681e30365f5e4baebc1c03dbadad6f39 Asian Pacific Journal of Tropical Medicine, Vol 12, Iss 12, Pp 552-558 (2019) enteric fever and climate el niño la niña and enteric fever el niño southern oscillations typhoid indian ocean dipole salmonella and climate Arctic medicine. Tropical medicine RC955-962 article 2019 ftdoajarticles https://doi.org/10.4103/1995-7645.272485 2022-12-31T11:22:28Z Objective: To explore the relationship between climate variables and enteric fever in the city of Ahmedabad and report preliminary findings regarding the influence of El Niño Southern Oscillations and Indian Ocean Dipole over enteric fever incidence. Method: A total of 29 808 Widal positive enteric fever cases reported by the Ahmedabad Municipal Corporation and local climate data in 1985-2017 from Ahmedabad Meteorology Department were analysed. El Niño, La Niña, neutral and Indian Ocean Dipole years as reported by the National Oceanic and Atmospheric Administration for the same period were compared for the incidence of enteric fever. Results: Population-normalized average monthly enteric fever case rates were the highest for El Niño years (25.5), lower for La Niña years (20.5) and lowest for neutral years (17.6). A repeated measures ANOVA analysis showed no significant difference in case rates during the three yearly El Niño Southern Oscillations categories. However, visual profile plot of estimated marginal monthly means showed two distinct characteristics: an early rise and peaking of cases in the El Niño and La Niña years, and a much more restrained rise without conspicuous peaks in neutral years. Further analysis based on monthly El Niño Southern Oscillations categories was conducted to detect differences in median monthly case rates. Median case rates in strong and moderate El Niño months and strong La Niña months were significantly dissimilar from that during neutral months (P<0.001). Conclusions: El Niño Southern Oscillations events influence the incidence of enteric fever cases in Ahmedabad, and further investigation from more cities and towns is required. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Indian Asian Pacific Journal of Tropical Medicine 12 12 552 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
enteric fever and climate el niño la niña and enteric fever el niño southern oscillations typhoid indian ocean dipole salmonella and climate Arctic medicine. Tropical medicine RC955-962 |
spellingShingle |
enteric fever and climate el niño la niña and enteric fever el niño southern oscillations typhoid indian ocean dipole salmonella and climate Arctic medicine. Tropical medicine RC955-962 Veena Iyer Susanna Abraham Cottagiri Ayushi Sharma Divya Nair Mehul S. Raval Bhavin Solanki Dileep Mavalankar Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017 |
topic_facet |
enteric fever and climate el niño la niña and enteric fever el niño southern oscillations typhoid indian ocean dipole salmonella and climate Arctic medicine. Tropical medicine RC955-962 |
description |
Objective: To explore the relationship between climate variables and enteric fever in the city of Ahmedabad and report preliminary findings regarding the influence of El Niño Southern Oscillations and Indian Ocean Dipole over enteric fever incidence. Method: A total of 29 808 Widal positive enteric fever cases reported by the Ahmedabad Municipal Corporation and local climate data in 1985-2017 from Ahmedabad Meteorology Department were analysed. El Niño, La Niña, neutral and Indian Ocean Dipole years as reported by the National Oceanic and Atmospheric Administration for the same period were compared for the incidence of enteric fever. Results: Population-normalized average monthly enteric fever case rates were the highest for El Niño years (25.5), lower for La Niña years (20.5) and lowest for neutral years (17.6). A repeated measures ANOVA analysis showed no significant difference in case rates during the three yearly El Niño Southern Oscillations categories. However, visual profile plot of estimated marginal monthly means showed two distinct characteristics: an early rise and peaking of cases in the El Niño and La Niña years, and a much more restrained rise without conspicuous peaks in neutral years. Further analysis based on monthly El Niño Southern Oscillations categories was conducted to detect differences in median monthly case rates. Median case rates in strong and moderate El Niño months and strong La Niña months were significantly dissimilar from that during neutral months (P<0.001). Conclusions: El Niño Southern Oscillations events influence the incidence of enteric fever cases in Ahmedabad, and further investigation from more cities and towns is required. |
format |
Article in Journal/Newspaper |
author |
Veena Iyer Susanna Abraham Cottagiri Ayushi Sharma Divya Nair Mehul S. Raval Bhavin Solanki Dileep Mavalankar |
author_facet |
Veena Iyer Susanna Abraham Cottagiri Ayushi Sharma Divya Nair Mehul S. Raval Bhavin Solanki Dileep Mavalankar |
author_sort |
Veena Iyer |
title |
Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017 |
title_short |
Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017 |
title_full |
Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017 |
title_fullStr |
Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017 |
title_full_unstemmed |
Effect of El Niño Southern Oscillations on the incidence of enteric fever in Ahmedabad, India from 1985 to 2017 |
title_sort |
effect of el niño southern oscillations on the incidence of enteric fever in ahmedabad, india from 1985 to 2017 |
publisher |
Wolters Kluwer Medknow Publications |
publishDate |
2019 |
url |
https://doi.org/10.4103/1995-7645.272485 https://doaj.org/article/681e30365f5e4baebc1c03dbadad6f39 |
geographic |
Arctic Indian |
geographic_facet |
Arctic Indian |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Asian Pacific Journal of Tropical Medicine, Vol 12, Iss 12, Pp 552-558 (2019) |
op_relation |
http://www.apjtm.org/article.asp?issn=1995-7645;year=2019;volume=12;issue=12;spage=552;epage=558;aulast=Iyer https://doaj.org/toc/2352-4146 2352-4146 doi:10.4103/1995-7645.272485 https://doaj.org/article/681e30365f5e4baebc1c03dbadad6f39 |
op_doi |
https://doi.org/10.4103/1995-7645.272485 |
container_title |
Asian Pacific Journal of Tropical Medicine |
container_volume |
12 |
container_issue |
12 |
container_start_page |
552 |
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1766343238124306432 |