LONDON – In the backyards of rural Cambodia, a tiny weapon is being deployed to fight dengue fever, the world’s fastest-spreading tropical disease, which causes debilitating flu-like symptoms and can develop into a deadly hemorrhagic fever.

More than 3,000 households in Kampong Cham province, which has one of the highest dengue rates in Cambodia, have been given colorful guppy fish to breed in barrels of water that villagers keep close to their homes for cleaning and cooking.

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