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Mosquito-borne illness

Looking for the answer to the USA Today Up & Down Words clue “Mosquito-borne illness”? The solution is YELLOW FEVER, a two-word phrase and answer #1 in the daily word chain. This clue was most recently seen in the June 24, 2026 (Wednesday) puzzle. The second word of each answer starts the next — see the full chain below.

Answer
YELLOWFEVER