89.7% cases occurred among the fully vaccinated

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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)

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)

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)

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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