Thread by @sailorrooscout

Just HOW effective are the COVID-19 vaccines at protecting you from severe illness and hospitalization even in the face of Delta?

BEFORE Delta variant increase: 95% effective

DURING Delta variant increase: 92% effective

Answer: VERY EFFECTIVE

Let’s discuss. 🧵

Real-world data out of King County, WA (which includes Seattle) confirms vaccinated individuals are significantly better protected from illness, hospitalization, AND death due to COVID-19 compared to unvaccinated individuals, even as the Delta variant surges through the state.

Over the PAST 30 days, unvaccinated individuals were:
•7X more likely to test positive for COVID-19 (69% of cases)
•49X more likely to be hospitalized for COVID-19 (87% of hospitalizations)
•32X more likely to die of COVID-19 related illness (72% of deaths)

Charts measuring COVID-19 between the two groups show a sharp, unrelenting increase in unvaccinated cases in Washington in August, while vaccinated cases peaked on August 10th before again declining. Over the last month, fully vaccinated cases NEVER exceeded 13 cases per 100,000

residents, a high reached on August 10th, before again declining, while unvaccinated cases continued to climb through the month, topping at 90 cases per 100,000 people on August 26th. You can find the dashboard here: kingcounty.gov/depts/health/c… which does provide case demographics.

You can also read more here: seattletimes.com/seattle-news/h… and a really good thread on vaccine effectiveness here:

https://twitter.com/mugecevik/status/1430218372348878860?s=21

Another set of real-world data comes out of the Yale New Haven Health System in CT. Researchers here describe the impact of vaccination on admission to hospital in patients with confirmed SARS-CoV-2 infections.

Data shows 95% of 969 COVID-19 related hospitalizations were in those NOT FULLY vaccinated. Of the 54 FULLY vaccinated hospitalizations:
•25 (46%) were asymptomatic (in other words, admitted for a non-COVID related condition but tested positive upon screening)

•14 (26%) had severe/critical disease (average age ~80, and most had former comorbidities)

A July 2021 study of Los Angeles, California public health records found unvaccinated individuals had 5X more COVID-infections than vaccinated individuals AND had 29X more COVID-19 hospitalizations than fully vaccinated individuals.

The Delta variant became the predominant variant in Los Angeles County during May-July 2021. During this period, SARS-CoV-2 cases and hospitalizations increased substantially, most notably amongst unvaccinated individuals. cdc.gov/mmwr/volumes/7…

Another study, this time out of New York shows the current COVID-19 vaccines were highly effective against hospitalization (VE >90%) for fully vaccinated New York residents, even during a period during which prevalence of the Delta variant increased from

<2% to >80% in the U.S. region that includes New York, societal public health restrictions eased, AND adult full-vaccine coverage in New York neared 65%. You can read more here: cdc.gov/mmwr/volumes/7…

Lastly, data out the Indiana Department of Health. For the week of August 22nd-29th there were 1,442 new COVID-19 hospital admissions. LESS THAN 20 of those were vaccinated individuals. coronavirus.in.gov/vaccine/2680.h…