https://www.freepressjournal.in/mumbai/maharashtra-more-sero-surveillance-needed-to-fight-dengue-national-institute-of-virology-to-union-government
The infection rate has increased to 88 per cent in 2019 from 63 per cent in 2009, according to a study by NIV, which also recommended the introduction of dengue vaccine for people nine years and older to check this rise.
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