KAMPALA, Uganda — Alice Nekesa did not know she was infected with malaria-causing parasites until it was too late. She was in the fourth month of pregnancy last year when she started bleeding, a miscarriage later attributed to untreated malaria in her.

The Ugandan farmer said recently that she regretted the loss of what would have been her second child “because I didn’t discover malaria and treat it early.”

Variations of such cases are commonly reported by Ugandan health workers who witness stillbirths or feverish babies that die within days from undiagnosed malaria. The deaths are part of a wider death toll tied to the mosquito-borne disease, the deadliest across Africa, but one easily treated in adults who seek timely medical care.

Until recently, a major gap in malaria treatment was

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