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More vaccines causes more infections
The risk of COVID-19 also varied by the number of COVID-19 vaccine doses previously received.
The higher the number of vaccines previously received,
the higher the risk of contracting COVID-19
Vaccine doses versus risk of covid during the 3-month study period
One dose, 1.7 times more likely to test positive for covid
Two doses, 2.63 times more likely to test positive for covid
Three doses, 3.1 times more likely to test positive for covid
More than three doses, 3.8 times more likely to test positive for covid
So compared to the unvaccinated
1, x 1.7
2, x 2.36
3, x 3.1
4, x 3.38
P = 0.001 means 999 out of 1,000 likely to be a genuine result
That 99.9% likely to be a genuine result
Effectiveness of the Coronavirus Disease 2019 (COVID-19) Bivalent Vaccine
https://www.medrxiv.org/content/10.1101/2022.12.17.22283625v1.full
In 2020
(published in 2021)
Evidence that vaccines prevented covid infection
https://www.medrxiv.org/content/10.1101/2021.06.02.21258231v1
This was when the human population had just encountered the novel Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) virus
Things Have Changed (Dylan)
Bivalent antigens vaccines
Original vaccine and BA.4/BA.5 lineages of Omicron.
(Approved without demonstration of effectiveness in human clinical studies)
(Approved without demonstration of safety in human clinical studies)
Background
To evaluate whether a bivalent COVID-19 vaccine protects against COVID-19.
Methods
Employees of Cleveland Clinic,
n = 51,011
Cumulative incidence of COVID-19 was examined over the following weeks.
Protection provided by recent and prior vaccination was evaluated
First bivalents given, 12 September 2022
Three-month study
Results
Among 51,011 employees,
20,689 (41%) had had a previous documented episode of COVID-19,
42,064 (83%) had received at least two doses of a vaccine.
10,804 (21%) were bivalent vaccine boosted
COVID-19 occurred in 2,452 (5%) during the study.
(Pfizer 89%, Moderna 11%)
Risk of COVID-19 increased with time since the most recent prior COVID-19 episode
Risk of COVID-19 increased with the number of vaccine doses previously received.
Note, this is based on large numbers
Doses, 0 = 6,419 (12.6%)
Doses, 1 = 2,528 (5%)
Doses, 2 = 14,810 (45.9%)
Doses, 3 = 23,396 (45.9%)
Doses 4, 3,757 (7.4%)
Doses 5, 85 (<1%)
Doses 6, 16 (<1%)
The bivalent vaccinated state
Was independently associated with lower risk of COVID-19 (HR, 0.70)
(over the 3 months of the study)
Leading to an estimated vaccine effectiveness (VE) of 30%
CDCs latest variant data
https://covid.cdc.gov/covid-data-tracker/#variant-proportions
Things Have Changed (Dylan)
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