VISALIA, Calif. — Bryan Ruiz moved his family into a newly built home in this Central Valley farming center seven months ago and almost immediately found they were under assault.
Mosquitoes bit and harassed them in broad daylight. He looked around, trying to find a water source where they were breeding, and noticed a freshly dug pipe, meant to drain water from the backyard to the front. He lifted its cap and inside found a small puddle in the drainage line, which didn’t have enough slope to fully empty.
He grabbed a turkey baster and drew water, already knowing what he would find: the larvae of Aedes aegypti, one of the greatest threats to humans on the planet.
