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The Dengue fever is prevalent in Sri lanka and most areas where there is bad pollution control, i.e. bins, flower pots, even flowers that have pooling areas within their stems.

Check out these websites and you can plenty more information about anything on Google, Just type in your question as you would here, and presto! The answer is there! :) How important is vertical transmission in mosquitoes for the - NCBI

https://www.ncbi.nlm.nih.gov/pubmed/21352772

by B Adams - 2010 - Cited by 1
How important is vertical transmission in mosquitoes for the persistence of dengue? Insights from a mathematical model. Adams B, Boots M. Department of ...

[PDF] Natural vertical transmission of dengue viruses by Aedes aegypti in ...

icmr.nic.in/ijmr/2008/april/0415.pdf

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by N Arunachalam - 2008 - Cited by 6 - Related articles
Vertical transmission of dengue was observed only in female progeny in experimental studies and no infection was observed in wild caught male mosquitoes in ...