Malaria was once commonly believed to be caused by breathing impure air, a notion that led to the theory of "malaria" (from Italian mal aria, meaning "bad air"). This belief was a widespread explanation for the disease before its true cause, the malaria parasite transmitted by mosquitoes, was discovered. The name "malaria" itself is a historical clue to this old theory of "bad air" causing the illness.
_____ was caused by breathing impure air was once a common belief.
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