Dengue virus in India has evolved, and scientists highlight the urgent need for a vaccine

Researchers at the Indian Institute of Science in Bengaluru have discovered
that the Dengue virus in India has undergone a significant amount of
evolution in recent years. The previously unknown information came to light
as a result of a computer investigation into the virus’s behavior over the
course of sixty years.
The investigation carried out by a number of different institutions came to
the conclusion that, over the course of the past half-century, there has
been a consistent rise in the number of instances of viral diseases
transmitted by mosquitoes, most notably in the countries located in
South-East Asia. The group investigated the four different serotypes of the
dengue virus and determined the degree to which each of these serotypes
differed from the sequencing of their parent virus.
According to the findings that were presented in the article that was
published in the journal PLoS Pathogens, the dengue virus propagates and
adapts to the selection pressures that are put on it by a variety of
circumstances. These factors can result in the appearance of new varieties.