An outbreak of dengue fever is suspected of killing dozens of people in India’s northern state of Uttar Pradesh since the start of September, and authorities launched a campaign to destroy mosquito breeding grounds.

According to the Pharmaceutical Research and Manufacturers of America (PhRMA), there are 264 vaccines in development to prevent and treat diseases.

The European Medicines Agency’s CHMP adopted a positive opinion for the marketing authorization of Sanofi’s dengue vaccine.