As the Zika virus continues to spread through the Americas, researchers have been scrambling to develop a vaccine—an achievement some say we could reach within the year.
That’s exciting news, but it raises a question. Why is it we’re able to whip up a vaccine for one mosquito-carried infection in just a few months but we still have no vaccine for one of the deadliest mosquito-borne illnesses on the planet: malaria?

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