Scientists identify climatic risks for dengue disease outbreaks


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According to Medical Xpress

dengue
A TEM micrograph showing Dengue virus virions (the cluster of dark dots near the center). Image: CDC

The University of Liverpool is part of an international team of scientists that have identified the climatic risks for dengue disease outbreaks, with a new study undertaken in India.

This was achieved by evaluating the relationship of climatic factors in the spread of dengue in different climatic zones in the country through the states of Punjab, Haryana, Rajasthan, Gujarat and Kerala.

The researchers focused on changes in a factor called ‘extrinsic  (EIP)’ of the  by taking into account daily and monthly mean temperatures in these areas.

EIP is the time taken for incubation of the virus in the mosquito. During this period, after the mosquito draws a virus-rich-blood meal, the virus escapes the gut, passes through the mosquito’s body and reaches it salivary glands. Once this happens, the mosquito is infectious and capable of transmitting the virus to a human host.

It has been found that climatic conditions play an important role in EIP. Lower temperatures (17-18 °C) result in longer EIPs thereby leading to decreased virus transmission. With increasing temperatures, feeding increases because of enhanced metabolism of the mosquito, leading to shorter EIPs.

Even a 5-day decrease in the incubation period can hike transmission rate by three times, and with an increase in  from 17 to 30 °C, dengue transmission increases fourfold. However, a further increase in temperature beyond 35 °C is detrimental to the mosquito survival.

Read more…

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This article and images were originally posted on [Medical Xpress] September 1, 2017 at 11:39AM

Credit to Author and Medical Xpress

 

 

 

 

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