First evidence of dengue virus infection in wild caught mosquitoes during an outbreak in Assam, Northeast India

Dengue is one of the major public health problems worldwide, transmitted mainly by Aedes aegypti and Ae. albopictus mosquitoes. Rapid urbanisation and industrialisation have led to an increase in vector population in Northeastern states of India. In 2013, Guwahati, the capital city of Assam, India e...

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Bibliographic Details
Published in:Journal of vector borne diseases 2015-12, Vol.52 (4), p.293-298
Main Authors: Dutta, Prafulla, Khan, Siraj Ahmed, Chetry, Sumi, Dev, Vas, Sarmah, Chandra Kanta, Mahanta, Jagadish
Format: Article
Language:English
Subjects:
Aedes
Aedes - virology
Aedes aegypti
Ae. albopictus
dengue
NS1-ELISA
RT-PCR
TOT
Animals
Antigens
Dengue - epidemiology
Dengue - transmission
Dengue - virology
Dengue fever
Dengue Virus - genetics
Dengue Virus - isolation & purification
Dengue Virus - physiology
Distribution
Environmental aspects
Epidemics
Female
Health aspects
India - epidemiology
Infections
Insect populations
Insect Vectors - virology
Laboratories
Male
Medical climatology
Medical research
Molecular weight
Mosquitoes
Surveillance
Viruses
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Summary:Dengue is one of the major public health problems worldwide, transmitted mainly by Aedes aegypti and Ae. albopictus mosquitoes. Rapid urbanisation and industrialisation have led to an increase in vector population in Northeastern states of India. In 2013, Guwahati, the capital city of Assam, India experienced an outbreak of dengue. This study was undertaken with an objective to determine infection rates of dengue viruses (DENV) in both the established vectors present in this region. During the outbreak (2013), adults and larvae of both the vector species were collected from different container habitats found in case reporting areas and container index was also recorded. The mosquitoes were first pooled, homogenised and processed for NS1-ELISA. This was followed by RT-PCR of the mosquito pools. Both Ae. aegypti and Ae. albopictus were found breeding in containers with container index in the range of 29.41 to 80%. Six pools of Ae. aegypti were found to be positive for NS1 antigen. RT-PCR assay revealed positivity in only the NS1-ELISA positive pools, exhibiting circulation of serotype DENV-2. Minimum infection rate of female and male Ae. aegypti was recorded as 10.87 and 11.03 respectively. This is the maiden report of detection of DENV in wild caught Ae. aegypti mosquitoes from Northeastern Region of India. The study also demonstrates the presence of transovarial transmission of dengue virus in this part of country. This information is useful in respect of both entomological as well as epidemiological point of view for taking appropriate vector control measures.
ISSN:0972-9062
DOI:10.4103/0972-9062.172830