Two separate studies find higher Covid-19 breakthrough infection rates in patients with cancer and dementia respectively
that went through electronic health records to find out how prevalent Covid-19 was in vaccinated patients with cancer, looking at the number of infections, hospitalisations and mortality rates.
The cancer patients in the study received vaccinations between December 2020 and November 2021 and had not been infected with Covid-19 before they received their shots. The control group consisted of vaccinated individuals who did not have cancer. The highest risk of breakthrough infections was in people with pancreatic cancer at 24.7 percent, liver cancer 22.8 percent, lung cancer 20.4 percent and colorectal cancer 17.5 percent.
The risk of death was 6.7 percent following a breakthrough infection, compared to 1.3 percent in patients without cancer. The study notes that in the clinical trial for the Pfizer-BioNTech vaccine, the median age for the 37,706 participants was 52 years and included only 18 people with dementia, a very minor segment of the trial .
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