An article from The Telegraph :
" Dengue has become more dangerous this year with two additional strains of the virus making inroads into the city, triggering the most virulent outbreak of the vector-borne disease in recent years.
A study by the National Institute for Cholera and Enteric Diseases (NICED) confirmed on Thursday that types 1 and 4 of the dengue virus were responsible for the severity.
According to the study, as many as 23 out of every 1,000 Calcuttans were infected over the past 12 months.
“That is a very high rate of prevalence, comparable to other hyper endemic countries like Thailand, Columbia, Nicaragua and some other Latin American locations,” said a scientist at the institute.
The NICED study, which covered 30,000 people with high fever across the city between 2009 and October 2010, revealed a distinct change in the pattern of infection this year."
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