"WHO is preparing for a very high probability that 2023 and 2024 will be marked by an El Nino event, which could increase the transmission of dengue fever and other so-called arboviruses such as Zika and chikungunya," Ghebreyesus said.
The WHO chief also warned that climate change is fueling the proliferation of mosquitoes and that dengue fever has already surged in recent decades, particularly in the Americas. (Tedros Adhanom Ghebreyesus)