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by dragontamer
1650 days ago
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The vaccines are 90% effective against the original strain and Alpha to transmission / infection. Efficacy dropped to 60% vs Delta, and drops again to 30% vs Omicron. Boosters seem to rise back up to 90% vs Delta and 75% vs Omicron. That's why so many people are talking about boosters: it has a measurable impact on transmission for Omicron (and Delta). |
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