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A study out of RIVM (Netherlands) shows vaccine efficacy for full vaccination in regards to the Delta variant against ICU admission was 97% and against hospitalization was 95%. Vaccine efficacy was high in ALL age groups and did NOT show waning with time even after four months.
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The RIVM is the National Institute for Public Health and the Environment in the Netherlands pic.twitter.com/H5o4uC8uPP
— simonthong aka kitty poo (@KittyPo80176717) September 21, 2021
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A study out of RIVM (Netherlands) shows vaccine efficacy for full vaccination in regards to the Delta variant against ICU admission was 97% and against hospitalization was 95%. Vaccine efficacy was high in ALL age groups and did NOT show waning with time even after four months.🧵
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
Pfizer, AstraZeneca, and Johnson & Johnson), time since vaccination, and prevailing variant (Alpha or Delta). For the study period 4 April- 29 August 2021, 15,571 hospitalized people with COVID-19 were included in the analysis, of whom 887 (5.7%) were fully vaccinated.
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
Of 15,571 included patients, 887 (5.7%) were fully vaccinated on the date of disease onset, 1,111 (7.1%) were partly vaccinated and 13,574 (87.2%) were unvaccinated. Of the 13,574 unvaccinated patients, 7,406 were found in the CIMS registry with a vaccination date after
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
in the Alpha period and 97% (95% CI 97-98%) in the Delta period. Vaccine efficacy was high in all age groups and did NOT show waning with time since vaccination UP TO (NOT ONLY as this was the length of the study period) 20 weeks (over four months) after full vaccination.
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
100.000 person-days is far lower among vaccinated than among unvaccinated persons. The similar numbers in absolute terms in the age group 70 years and older are due to the HIGH vaccination coverage in this group. NOTE: A lot of people tend to miss this point!
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
are visible for ICU admissions (Figure 2a and 2b), although the absolute number of ICU admissions in vaccinated persons was still well below the number of ICU admissions in unvaccinated persons. pic.twitter.com/ygYe2ssw1q
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
Conclusion: This study using nationwide surveillance data found 95% and 97% effectiveness of the COVID-19 vaccines used in the Netherlands against hospitalization and ICU admission, respectively. This high VE persisted into the Delta period and OVER 20 weeks after full pic.twitter.com/tXXFujxRR6
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
against severe COVID-19 over time. In their data, adjusting for 5-year age groups, researchers here did not observe such waning even UP TO (NOT ONLY mind you) 20-plus weeks after full vaccination. You can find this study here: https://t.co/YQv66EenhF
— Chise 🔜 TFF GOH (@sailorrooscout) September 20, 2021
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weehingthong 
So we don’t need to spend money on boosters.