Researchers tested a genetically attenuated malaria parasite as a vaccine in 10 human volunteers using infected mosquito bites with a single exposure consisting of 150 to 200 bites per subject. All subjects remained blood stage–negative and developed inhibitory antibodies to malaria parasites.

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Researchers tested a genetically attenuated malaria parasite as a vaccine in 10 human volunteers using infected mosquito bites with a single exposure consisting of 150 to 200 bites per subject. All subjects remained blood stage–negative and developed inhibitory antibodies to malaria parasites.