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Last week, the W.H.O. said a combination of factors, including climate change, had contributed to the rise of dengue cases around the world, with millions of people infected.

The warming planet has worsened weather patterns in South Asia, resulting in monsoon seasons that are wetter and hotter — conditions that create a favorable breeding environment for the Aedes mosquitoes that carry the virus.

The WHO announcement appears to have been last month, rather than last week.