89.7% cases occurred among the fully vaccinated

🕒 3 min read • ✍️ 470 words

High COVID-19 vaccination rates were expected to reduce transmission of SARS-CoV-2 in populations by reducing the number of possible sources for transmission and thereby to reduce the burden of COVID-19 disease.

Recent data indicates the epidemiological relevance of COVID-19 vaccinated individuals is increasing.

Breakthrough infections provide clear evidence of increasing relevance of fully vaccinated as a possible source of transmission.

Peak viral load did not differ by
vaccination status or variant type.

Many decisionmakers assume that the vaccinated can be excluded as a source of transmission.

89.7% symptomatic cases occurred among the fully vaccinated.

3.4% among the unvaccinated.

“It appears to be grossly negligent to ignore the vaccinated population as a possible and relevant source of transmission when deciding about public health control measures.”

The Lancet, Nov 19 2021

The source was a fully vaccinated COVID-19 patient. The vaccination rate was 96.2% among all exposed individuals (151 healthcare workers and 97 patients). Fourteen fully vaccinated patients became severely ill or died, the two unvaccinated patients developed a mild disease.^{⁽⁰¹⁾Shitrit P, Zuckerman NS, Mor O, Gottesman BS, Chowers M. Nosocomial outbreak caused by the SARS-CoV-2 Delta variant in a highly vaccinated population, Israel, July 2021. Euro Surveill 2021;26(39):2100822. doi: 10.2807/1560-7917. ES.2021.26.39.2100822}

The US Centres for Disease Control and Prevention (CDC) identifies four of the top five counties with the highest percentage of fully vaccinated population (99.984.3%) as “high” transmission counties. ^{⁽⁰²⁾Subramanian SV, Kumar A. Increases in COVID-19 are unrelated to levels of vaccination across 68 countries and 2947 counties in the United States. Eur J Epidemiol doi: 10.1007/s10654-021-00808-7}

Figure 1
Vaccination rates and proportions of fully vaccinated people among symptomatic COVID-19 cases (≥ 60 years) in Germany between 21. July and 27. October 2021 based on the weekly reports from the Robert Koch-Institute

Günter Kampf, The epidemiological relevance of the COVID-19-vaccinated population is increasing, The Lancet Regional Health – Europe, Volume 11, 2021, 100272, ISSN 2666-7762 ^{⁽⁰³⁾Günter Kampf, The epidemiological relevance of the COVID-19-vaccinated population is increasing, The Lancet Regional Health – Europe, Volume 11, 2021, 100272, ISSN 2666-7762, https://doi.org/10.1016/j.lanepe.2021.100272. … Click for full citation}

Dr. Janci Chunn Lindsay is the Director of Toxicology and Molecular Biology for Toxicology Support Services, LLC. She holds a doctorate in Biochemistry and Molecular Biology from the University of Texas Graduate School of Biomedical Sciences, M.D. Anderson Cancer Center-Houston.

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Verifiable References for Australians

References[+]References[−]

References
01	Shitrit P, Zuckerman NS, Mor O, Gottesman BS, Chowers M. Nosocomial outbreak caused by the SARS-CoV-2 Delta variant in a highly vaccinated population, Israel, July 2021. Euro Surveill 2021;26(39):2100822. doi: 10.2807/1560-7917. ES.2021.26.39.2100822
02	Subramanian SV, Kumar A. Increases in COVID-19 are unrelated to levels of vaccination across 68 countries and 2947 counties in the United States. Eur J Epidemiol doi: 10.1007/s10654-021-00808-7
03	Günter Kampf, The epidemiological relevance of the COVID-19-vaccinated population is increasing, The Lancet Regional Health – Europe, Volume 11, 2021, 100272, ISSN 2666-7762, https://doi.org/10.1016/j.lanepe.2021.100272. (https://www.thelancet.com/journals/lanepe/article/PIIS2666-7762(21)00258-1/fulltext?s=08#%20) (https://www.sciencedirect.com/science/article/pii/S2666776221002581) (https://www.thelancet.com/action/showPdf?pii=S2666-7762%2821%2900258-1)