Mexican health authorities Saturday began aerial spraying of southern Tabasco state, including its capital Villahermosa, after massive floods earlier this month raised a bumper crop of mosquitos that can spread dengue.
"The job will cover the 10,000 hectares (24,700 acres) of Villahermosa and surroundings and will be complemented with ground of streets and empty lots and homes," the Health Ministry said in a statement.
The fumigation operation, it added, will be carried out in three phases of three days each, ending in early December.
Tabasco and neighboring Chiapas states suffered widespread flooding after driving rains in late October and early November swelled rivers in the regions and triggered deadly lanslides that swallowed one village.
More than half of Tabasco's two million population were forced to evacuate their homes at the height of the flooding -- one of Mexico's worst, that has left at least 15 people dead, another 10 still missing and tens of thousands homeless.