Results varied by region, however. In the U.S., the single dose was 72 percent effective at preventing both moderate and severe illness. (Moderate illness included symptoms such as low oxygen levels, shortness of breath or deep vein thrombosis.) In Latin America, the effectiveness was lower, at 66 percent. And in South Africa, where a worrisome variant is the predominant strain, the effectiveness fell to 57 percent.
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January 29, 2021 at 08:03PM
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Johnson & Johnson vaccine effective against COVID, though weaker against South Africa variant - WRCB-TV
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