Friday, February 4, 2022

DISCLOSURE: Scientists Claim Higher Rate of Past Delta-Variant Cases in Un-Vaxxed Individuals, Higher Rate of Omicron Variant in Vaxxed

Source: Med R XIV

Published: January 25, 2022

By: Chrispin Chaguza, Andreas Coppi, Rebecca Earnest, David Ferguson, Nicholas Kerantzas, Frederick Warner, H. Patrick Young, Mallery I. Breban, Kendall Billig, Robert Tobias Koch, Kien Pham, Chaney C. Kalinich, Isabel M. Ott, Joseph R. Fauver, Anne M. Hahn, Irina R. Tikhonova, Christopher Castaldi, Bony De Kumar, Christian M. Pettker, Joshua L. Warren, Daniel M. Weinberger, Marie L. Landry, David R. Peaper, Wade Schulz, Chantal B.F. Vogels, Nathan D. Grubaugh

Rapid emergence of SARS-CoV-2 Omicron variant is associated with an infection advantage over Delta in vaccinated persons



The emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants continues to shape the coronavirus disease 2019 (Covid-19) pandemic. The detection and rapid spread of the SARS-CoV-2 ‘ Omicron’ variant (lineage B.1.1.529) in Botswana and South Africa became a global concern because it contained 15 mutations in the spike protein immunogenic receptor binding domain and was less neutralized by sera derived from vaccinees compared to the previously dominant Delta variant.

To investigate if Omicron is more likely than Delta to cause infections in vaccinated persons, we analyzed 37,877 nasal swab PCR tests conducted from 12-26 December 2021 and calculated the test positivity rates for each variant by vaccination status. We found that the positivity rate among unvaccinated persons was higher for Delta (5.2%) than Omicron (4.5%).


We found similar results in persons who received a single vaccine dose. Conversely, our results show that Omicron had higher positivity rates than Delta among those who received two doses within five months (Omicron = 4.7% vs. Delta = 2.6%), two doses more than five months ago (4.2% vs. 2.9%), and three vaccine doses (2.2% vs. 0.9%). Our estimates of Omicron positivity rates in persons receiving one or two vaccine doses were not significantly lower than unvaccinated persons but were 49.7% lower after three doses.

In comparison, the reduction in Delta positivity rates from unvaccinated to 2 vaccine doses was 45.6-49.6% and to 3 vaccine doses was 83.2%. Despite the higher positivity rates for Omicron in vaccinated persons, we still found that 91.2% of the Omicron infections in our study occurred in persons who were eligible for 1 or more vaccine doses at the time of PCR testing. In conclusion, escape from vaccine-induced immunity likely contributed to the rapid rise in Omicron infections.

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