The Hidden Burden of Dengue and Chikungunya in Chennai, India
Publication Date
July 16, 2015
Journal
PLOS Neglected Tropical Diseases
Authors
Isabel Rodríguez Barraquer, Sunil S. Solomon, Periaswamy Kuganantham, Aylur Kailasom Srikrishnan, et al
Volume
9
Issue
7
Pages
e0003906
DOI
https://dx.plos.org/10.1371/journal.pntd.0003906
Publisher URL
http://journals.plos.org/plosntds/article?id=10.1371%2Fjournal.pntd.0003906
PubMed
http://www.ncbi.nlm.nih.gov/pubmed/26181441
PubMed Central
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4504702
Europe PMC
http://europepmc.org/abstract/MED/26181441
Web of Science
000359079700021
Scopus
84938563766
Mendeley
http://www.mendeley.com/research/hidden-burden-dengue-chikungunya-chennai-india-1
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Mendeley | Further Information

{"title"=>"The hidden burden of dengue and chikungunya in chennai, India", "type"=>"journal", "authors"=>[{"first_name"=>"Isabel", "last_name"=>"Rodríguez-Barraquer", "scopus_author_id"=>"23987236100"}, {"first_name"=>"Sunil S.", "last_name"=>"Solomon", "scopus_author_id"=>"10045378300"}, {"first_name"=>"Periaswamy", "last_name"=>"Kuganantham", "scopus_author_id"=>"56764427800"}, {"first_name"=>"Aylur Kailasom", "last_name"=>"Srikrishnan", "scopus_author_id"=>"6603314209"}, {"first_name"=>"Canjeevaram K.", "last_name"=>"Vasudevan", "scopus_author_id"=>"25931837800"}, {"first_name"=>"Syed H.", "last_name"=>"Qbal", "scopus_author_id"=>"56764479700"}, {"first_name"=>"Pachamuthu", "last_name"=>"Balakrishnan", "scopus_author_id"=>"7006232578"}, {"first_name"=>"Suniti", "last_name"=>"Solomon", "scopus_author_id"=>"35262886000"}, {"first_name"=>"Shruti H.", "last_name"=>"Mehta", "scopus_author_id"=>"7401670716"}, {"first_name"=>"Derek A.T.", "last_name"=>"Cummings", "scopus_author_id"=>"9842706300"}], "year"=>2015, "source"=>"PLoS Neglected Tropical Diseases", "identifiers"=>{"pui"=>"605468723", "pmid"=>"26181441", "doi"=>"10.1371/journal.pntd.0003906", "issn"=>"19352735", "scopus"=>"2-s2.0-84938563766", "sgr"=>"84938563766", "isbn"=>"1935-2735(print), 1935-2735(electronic)"}, "id"=>"d7cc375a-7f98-3d99-abe8-758ee481c887", "abstract"=>"BACKGROUND: Dengue and chikungunya are rapidly expanding viruses transmitted by mosquitoes of the genus Aedes. Few epidemiological studies have examined the extent of transmission of these infections in South India despite an increase in the number of reported cases, and a high suitability for transmission.\\n\\nMETHODS AND FINDINGS: We conducted a household-based seroprevalence survey among 1010 individuals aged 5-40 years living in fifty randomly selected spatial locations in Chennai, Tamil Nadu. Participants were asked to provide a venous blood sample and to complete a brief questionnaire with basic demographic and daily activity information. Previous exposure to dengue and chikungunya was determined using IgG indirect ELISA (Panbio) and IgG ELISA (Novatec), respectively. We used this data to estimate key transmission parameters (force of infection and basic reproductive number) and to explore factors associated with seropositivity. While only 1% of participants reported history of dengue and 20% of chikungunya, we found that 93% (95%CI 89-95%) of participants were seropositive to dengue virus, and 44% (95%CI 37-50%) to chikungunya. Age-specific seroprevalence was consistent with long-tem, endemic circulation of dengue and suggestive of epidemic chikungunya transmission. Seropositivity to dengue and chikungunya were significantly correlated, even after adjusting for individual and household factors. We estimate that 23% of the susceptible population gets infected by dengue each year, corresponding to approximately 228,000 infections. This transmission intensity is significantly higher than that estimated in known hyperendemic settings in Southeast Asia and the Americas.\\n\\nCONCLUSIONS: These results provide unprecedented insight into the very high transmission potential of dengue and chikungunya in Chennai and underscore the need for enhanced surveillance and control methods.", "link"=>"http://www.mendeley.com/research/hidden-burden-dengue-chikungunya-chennai-india-1", "reader_count"=>91, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>4, "Researcher"=>27, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>12, "Student > Postgraduate"=>10, "Other"=>10, "Student > Master"=>11, "Student > Bachelor"=>9, "Lecturer"=>1, "Professor"=>2}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>4, "Researcher"=>27, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>12, "Student > Postgraduate"=>10, "Other"=>10, "Student > Master"=>11, "Student > Bachelor"=>9, "Lecturer"=>1, "Professor"=>2}, "reader_count_by_subject_area"=>{"Unspecified"=>5, "Agricultural and Biological Sciences"=>20, "Veterinary Science and Veterinary Medicine"=>1, "Computer Science"=>2, "Earth and Planetary Sciences"=>1, "Engineering"=>1, "Environmental Science"=>2, "Biochemistry, Genetics and Molecular Biology"=>3, "Nursing and Health Professions"=>1, "Mathematics"=>4, "Medicine and Dentistry"=>38, "Psychology"=>1, "Social Sciences"=>1, "Immunology and Microbiology"=>8, "Pharmacology, Toxicology and Pharmaceutical Science"=>1, "Economics, Econometrics and Finance"=>2}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>38}, "Social Sciences"=>{"Social Sciences"=>1}, "Psychology"=>{"Psychology"=>1}, "Mathematics"=>{"Mathematics"=>4}, "Unspecified"=>{"Unspecified"=>5}, "Environmental Science"=>{"Environmental Science"=>2}, "Pharmacology, Toxicology and Pharmaceutical Science"=>{"Pharmacology, Toxicology and Pharmaceutical Science"=>1}, "Engineering"=>{"Engineering"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>1}, "Immunology and Microbiology"=>{"Immunology and Microbiology"=>8}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>2}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>20}, "Computer Science"=>{"Computer Science"=>2}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>3}, "Veterinary Science and Veterinary Medicine"=>{"Veterinary Science and Veterinary Medicine"=>1}}, "reader_count_by_country"=>{"Canada"=>1, "Bhutan"=>1, "United States"=>2, "Brazil"=>2, "United Kingdom"=>3, "France"=>1, "Germany"=>1, "India"=>1}, "group_count"=>19}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/2179550"], "description"=>"<p>Map of Chennai showing population density estimates and the 50 locations sampled in the study.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486182, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.g001", "stats"=>{"downloads"=>2, "page_views"=>17, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Map_of_Chennai_showing_population_density_estimates_and_the_50_locations_sampled_in_the_study_/1486182", "title"=>"Map of Chennai showing population density estimates and the 50 locations sampled in the study.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179551"], "description"=>"<p>Household and participant enrollment.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486183, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.g002", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Household_and_participant_enrollment_/1486183", "title"=>"Household and participant enrollment.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179552"], "description"=>"<p>+ symbols indicate sampled locations. Seroprevalence for the rest of locations was interpolated using inverse distance weighting.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486184, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.g003", "stats"=>{"downloads"=>1, "page_views"=>10, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Seroprevalence_to_dengue_and_chikungunya_by_location_in_Chennai_/1486184", "title"=>"Seroprevalence to dengue and chikungunya by location in Chennai.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179553"], "description"=>"<p>Data was aggregated into 3-year groups. Dengue: Solid blue lines show the fit of the constant (dashed) and time varying model to the data. Chikungunya: Solid line shows the fit of a Loess smoother.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486185, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.g004", "stats"=>{"downloads"=>3, "page_views"=>23, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Age_specific_seroprevalence_to_dengue_and_chikungunya_with_95_confidence_lines_/1486185", "title"=>"Age-specific seroprevalence to dengue and chikungunya with 95% confidence lines.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179555"], "description"=>"<p>Solid lines indicate the average R<sub>0</sub> estimated for Chennai as a whole.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486187, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.g005", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Histogram_showing_the_distribution_of_location_specific_R_0_estimated_from_the_data_/1486187", "title"=>"Histogram showing the distribution of location specific R<sub>0</sub> estimated from the data.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179556"], "description"=>"<p>* Self reported</p><p>Characteristics of participants.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486188, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.t001", "stats"=>{"downloads"=>1, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Characteristics_of_participants_/1486188", "title"=>"Characteristics of participants.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179557"], "description"=>"<p>*Includes data from two additional households that answered questionnaire but did not provide blood samples</p><p><sup>†</sup>Participants were allowed to list up to 2 sources</p><p>Selected characteristics of participating households (n = 438).</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486189, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.t002", "stats"=>{"downloads"=>6, "page_views"=>14, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Selected_characteristics_of_participating_households_n_438_/1486189", "title"=>"Selected characteristics of participating households (n = 438).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179558"], "description"=>"<p>*We fit models with increasing number of parameters. Thus, while model A assumes that the force of infection has been constant historically, models B and C allow for periods with different transmission intensity.</p><p><sup>†</sup> p-value of a likelihood ratio test comparing model B vs. model A.</p><p><sup>γ</sup>p-value of a likelihood ratio test comparing model C vs. model B.</p><p>Estimates of the force of infection (λ, summed across all serotypes) and R<sub>0</sub> obtained from catalytic models fit to dengue age-specific seroprevalence data.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486190, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.t003", "stats"=>{"downloads"=>1, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Estimates_of_the_force_of_infection_summed_across_all_serotypes_and_R_0_obtained_from_catalytic_models_fit_to_dengue_age_specific_seroprevalence_data_/1486190", "title"=>"Estimates of the force of infection (λ, summed across all serotypes) and R<sub>0</sub> obtained from catalytic models fit to dengue age-specific seroprevalence data.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179559"], "description"=>"<p>*Income categories are described in <a href=\"http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0003906#pntd.0003906.t002\" target=\"_blank\">table 2</a></p><p>All models included a random effect for location.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486191, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.t004", "stats"=>{"downloads"=>5, "page_views"=>19, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Results_of_univariate_logistic_regression_of_the_association_between_seropositivity_to_Chikungunya_Dengue_and_several_household_and_individual_factors_/1486191", "title"=>"Results of univariate logistic regression of the association between seropositivity to Chikungunya/Dengue and several household and individual factors.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179560"], "description"=>"<p>*Income categories are described in <a href=\"http://www.plosntds.org/article/info:doi/10.1371/journal.pntd.0003906#pntd.0003906.t002\" target=\"_blank\">table 2</a></p><p>Results of the best fitting model (based on AIC) for each outcome are shown. All models included a random effect for location.</p>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486192, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>"https://dx.doi.org/10.1371/journal.pntd.0003906.t005", "stats"=>{"downloads"=>11, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Results_of_multiple_logistic_regression_of_the_association_between_seropositivity_to_Chikungunya_Dengue_Both_with_household_and_individual_factors_/1486192", "title"=>"Results of multiple logistic regression of the association between seropositivity to Chikungunya/Dengue/Both with household and individual factors.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2015-07-16 03:35:24"}
  • {"files"=>["https://ndownloader.figshare.com/files/2179561", "https://ndownloader.figshare.com/files/2179562", "https://ndownloader.figshare.com/files/2179563", "https://ndownloader.figshare.com/files/2179564"], "description"=>"<div><p>Background</p><p>Dengue and chikungunya are rapidly expanding viruses transmitted by mosquitoes of the genus <i>Aedes</i>. Few epidemiological studies have examined the extent of transmission of these infections in South India despite an increase in the number of reported cases, and a high suitability for transmission.</p><p>Methods and findings</p><p>We conducted a household-based seroprevalence survey among 1010 individuals aged 5-40 years living in fifty randomly selected spatial locations in Chennai, Tamil Nadu. Participants were asked to provide a venous blood sample and to complete a brief questionnaire with basic demographic and daily activity information. Previous exposure to dengue and chikungunya was determined using IgG indirect ELISA (Panbio) and IgG ELISA (Novatec), respectively. We used this data to estimate key transmission parameters (force of infection and basic reproductive number) and to explore factors associated with seropositivity. While only 1% of participants reported history of dengue and 20% of chikungunya, we found that 93% (95%CI 89-95%) of participants were seropositive to dengue virus, and 44% (95%CI 37-50%) to chikungunya. Age-specific seroprevalence was consistent with long-tem, endemic circulation of dengue and suggestive of epidemic chikungunya transmission. Seropositivity to dengue and chikungunya were significantly correlated, even after adjusting for individual and household factors. We estimate that 23% of the susceptible population gets infected by dengue each year, corresponding to approximately 228,000 infections. This transmission intensity is significantly higher than that estimated in known hyperendemic settings in Southeast Asia and the Americas.</p><p>Conclusions</p><p>These results provide unprecedented insight into the very high transmission potential of dengue and chikungunya in Chennai and underscore the need for enhanced surveillance and control methods.</p></div>", "links"=>[], "tags"=>["Tamil Nadu", "chennai", "Americas.ConclusionsThese results", "hyperendemic settings", "activity information", "household factors", "transmission intensity", "Previous exposure", "transmission parameters", "control methods", "Dengue virus", "ci", "South India", "genus Aedes", "IgG ELISA", "India BackgroundDengue", "1010 individuals", "infection", "epidemic chikungunya transmission", "southeast asia", "venous blood sample"], "article_id"=>1486193, "categories"=>["Biological Sciences", "Science Policy"], "users"=>["Isabel Rodriguez-Barraquer", "Sunil S. Solomon", "Periaswamy Kuganantham", "Aylur Kailasom Srikrishnan", "Canjeevaram K. Vasudevan", "Syed H. Iqbal", "Pachamuthu Balakrishnan", "Suniti Solomon", "Shruti H. Mehta", "Derek A. T. Cummings"], "doi"=>["https://dx.doi.org/10.1371/journal.pntd.0003906.s001", "https://dx.doi.org/10.1371/journal.pntd.0003906.s002", "https://dx.doi.org/10.1371/journal.pntd.0003906.s003", "https://dx.doi.org/10.1371/journal.pntd.0003906.s004"], "stats"=>{"downloads"=>36, "page_views"=>13, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_The_Hidden_Burden_of_Dengue_and_Chikungunya_in_Chennai_India_/1486193", "title"=>"The Hidden Burden of Dengue and Chikungunya in Chennai, India", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2015-07-16 03:35:24"}

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  • {"unique-ip"=>"18", "full-text"=>"20", "pdf"=>"2", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2018", "month"=>"12"}
  • {"unique-ip"=>"20", "full-text"=>"21", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"3", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"2"}
  • {"unique-ip"=>"10", "full-text"=>"12", "pdf"=>"7", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"3"}
  • {"unique-ip"=>"15", "full-text"=>"13", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"4"}
  • {"unique-ip"=>"30", "full-text"=>"29", "pdf"=>"4", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"5"}
  • {"unique-ip"=>"18", "full-text"=>"21", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"8"}
  • {"unique-ip"=>"20", "full-text"=>"23", "pdf"=>"1", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"9"}
  • {"unique-ip"=>"20", "full-text"=>"19", "pdf"=>"5", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"2", "supp-data"=>"0", "cited-by"=>"0", "year"=>"2019", "month"=>"10"}
  • {"unique-ip"=>"18", "full-text"=>"20", "pdf"=>"7", "scanned-summary"=>"0", "scanned-page-browse"=>"0", "figure"=>"0", "supp-data"=>"2", "cited-by"=>"0", "year"=>"2019", "month"=>"12"}

Relative Metric

{"start_date"=>"2015-01-01T00:00:00Z", "end_date"=>"2015-12-31T00:00:00Z", "subject_areas"=>[]}
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