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Moderna says the FDA is looking into reports of a rare side effect — myocarditis, or the inflammation of the heart muscle — in those who've gotten the shot.
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Drugmakers add inactive ingredients to stabilize medications and sometimes to help the body absorb the active ingredients. But the inactive constituents can cause side effects in rare cases.
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Global health activists say it's a big step toward wiping out malaria. But it will be tough to implement in poor countries.