French drugmaker Sanofi Pasteur revealed that clinical trials have shown that its new vaccine can protect against three of the four dengue virus strains.
The first trials in humans proved the vaccine was safe and represented a key milestone in the quest for a dengue jab, vaccine-maker Sanofi Pasteur executive vice president Michel De Wilde said in a statement.
"This is also an important development for global public health, since there is currently no specific treatment or prevention for dengue."
Researchers estimate that some three billion people live in regions susceptible to dengue contagion and another 20 million tourists pass through them.
The disease caused by one of four virus serotypes results in fever, aches, rashes, vomiting and in rare cases death. Children are especially vulnerable.
Sanofi Pasteur said its candidate vaccine was effective against three of the four virus serotypes and analyses were under way "to understand the lack of protection for the fourth".
The company conducted trials on 4,000 children aged four to 11 in Thailand's Muang district, the results of which have yet to be published in a peer-reviewed medical journal.
Larger Phase III trials with 31,000 adults and children are taking place in 10 countries in Asia and Latin America.