The efficacy of the first dengue fever vaccine is expected to be known by September when results of tests on thousands of Thai children will be revealed, the pharmaceutical firm Sanofi Pasteur said Thursday.

Sanofi Pasteur has been collaborating with Thailand’s Ministry of Health and Mahidol University in conducting dengue vaccine research and trials for the past two decades, with positive results anticipated by the third quarter of this year, Sanofi Pasteur’s programme leader Jean Lang said.

Read more: The Nation