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- W4308434855 abstract "An important aspect of vaccine effectiveness is its impact on pathogen transmissibility, harboring major implications for public health policies. As viral load is a prominent factor affecting infectivity, its laboratory surrogate, qRT-PCR cycle threshold (Ct), can be used to investigate the infectivity-related component of vaccine effectiveness. While vaccine waning has previously been observed for viral load during the Delta wave, less is known regarding how Omicron viral load is affected by vaccination status, and whether vaccine-derived and natural infection protection are sustained. By analyzing results of more than 460,000 individuals, we show that while recent vaccination reduces Omicron viral load, its effect wanes rapidly. In contrast, a significantly slower waning rate is demonstrated for recovered COVID-19 individuals. Thus, while the vaccine is effective in decreasing morbidity and mortality, its relatively small effect on transmissibility of Omicron (as measured here by Ct) and its rapid waning call for reassessment of future booster campaigns." @default.
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- W4308434855 date "2022-11-07" @default.
- W4308434855 modified "2023-10-18" @default.
- W4308434855 title "Viral load dynamics of SARS-CoV-2 Delta and Omicron variants following multiple vaccine doses and previous infection" @default.
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- W4308434855 doi "https://doi.org/10.1038/s41467-022-33096-0" @default.
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