89.7% cases occurred among the fully vaccinated


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 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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DISCLAIMER: The information on this website is not medical science or medical advice. I do not have any medical training aside from my own research and interest in this area. The information I publish is not intended to diagnose, treat, cure or prevent any disease, disorder, pain, injury, deformity, or physical or mental condition. I just report my own results, understanding & research.