Osong Public Health and Research Perspectives

Original Articles

Study on the Behavior of Dengue Viruses during Outbreaks with Reference to Entomological and Laboratory Surveillance in the Cuddalore, Nagapattinam, and Tirunelveli Districts of Tamil Nadu, India: Parasuraman Basker, Karumana Gounder Kolandaswamy; Osong Public Health Res Perspect. 2015;6(3):143-158. Published online June 30, 2015; DOI: https://doi.org/10.1016/j.phrp.2015.05.001

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Objectives
This study was carried out in order to understand the behavior of dengue viruses through the entomological and laboratory surveillance of outbreaks. The aim of the study was to provide additional research to support current knowledge of epidemiological, clinical, and laboratory diagnosis of dengue virus and ultimately to use this information to forecast dengue as well as to justify intervention measures.
Methods
Data on the presence of Aedes larvae in human dwellings during the entomological surveillance in Cuddalore, Nagapattinam, and Tirunelveli dengue outbreaks were taken to compute indices, namely the House Index (HI), Container index (CI), and the Breteau Index (BI). Standard procedures were followed for nonstructural Protein 1 (NS1) and immunoglobulin M enzyme linked immunosorbent assay for the confirmation of dengue. Serovar confirmation was made in the Kottayam field station of the Vector Control Research Center, Puducherry.
Results
Larval indices HI < 2–3% and BI < 20 contributed to halting the outbreak. Incubation of the dengue viruses in humans was detected at 15 days, NS1 was identified as a tool for the early diagnosis of dengue cases and its presence indicated the need to implement all available interventions. It was also discovered that it is helpful to search for hidden habitats of Aedes when dengue cases have not been reduced even after the sustainable management of the larval indices, HI < 5% and BI < 20. Based on the observed incidences of stopping dengue outbreaks, it was learnt that neighborhood areas of the outbreak villages, around 400 m, should have permissible larval indices < 5% HI and BI < 20. Heterogeneous serovars that led to dengue hemorrhagic fever and Dengue Shock Syndrome (DSS) were identified using reverse transcription polymerase chain reaction and reconfirmed in the field as DEN-1 and DEN-3 viruses and were circulating in Tirunelveli during the outbreak.
Conclusion
The behaviors of dengue viruses experienced in experimental, clinical, epidemiological, entomological, and laboratory surveillance did not deviate from observations in the field during dengue outbreaks in the Cuddalore, Nagapattinam, and Tirunelveli districts of Tamil Nadu, India.

Citations

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A systematic review of published literature on mosquito control action thresholds across the world
Vindhya S. Aryaprema, Madeline R. Steck, Steven T. Peper, Rui-de Xue, Whitney A. Qualls, Olaf Horstick
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Shuai Xu, Haoying An, Jiahai Dai, Haichang Zhang
Advances in Materials Science and Engineering.2022; 2022: 1. CrossRef
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Sayani Adak, Soovoojeet Jana
Soft Computing.2021; 25(1): 699. CrossRef
Epidemiology and challenges of dengue surveillance in the WHO South-East Asia Region
Tsheten Tsheten, Darren J Gray, Archie C A Clements, Kinley Wangdi
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Assessing the interplay between dengue incidence and weather in Jakarta via a clustering integrated multiple regression model
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Identification of Dengue Type 1 Virus (DENV-1) in Koreans Traveling Abroad: Young Eui Jeong, Yeon Hee Kim, Jung Eun Cho, Myung Guk Han, Young Ran Ju; Osong Public Health Res Perspect. 2011;2(1):34-40. Published online June 30, 2011; DOI: https://doi.org/10.1016/j.phrp.2011.04.002

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14 Download
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Abstract PDF

Objectives
To date, no indigenous dengue virus (DENV) transmissions have been reported in Korea. However, imported dengue infections have been diagnosed in travelers returning from endemic areas. This study presents the first virological evidence of travel-associated DENV importation into South Korea.
Methods
From January 2004 to June 2006, a total of 278 serum samples from 245 patients with suspected dengue fever were tested using the Panbio Dengue Duo IgM/IgG Rapid Strip Test. We selected 11 of the early symptomatic-phase sera that were negative for IgM and retrospectively studied them by virus isolation and reverse transcription-polymerase chain reaction.
Results
All 11 serum samples were found to be DENV positive by reverse transcription-polymerase chain reaction and viruses were successfully isolated from seven of the 11 serum samples. All the isolates were identified as DENV serotype-1.
Conclusion
We successfully isolated seven DENV serotype-1 strains for the first time in South Korea from imported infections. Considering that the vector mosquito, Aedes albopictus, already exists in South Korea, we propose that a vector surveillance program for dengue is urgently needed.

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