ALBANY, NY (NEWS10) – The New York State Department of Health (NYSDOH) has published a comparative study on vaccine immunity to COVID-19 and its effectiveness. The researchers found that from May to November 2021, COVID-19 cases and associated hospitalizations were significantly lower among those who had been vaccinated and/or had survived a previous infection.

According to the researchers, the study concluded that although the Delta variant emerged, new infections and hospitalizations were lowest among people who had previously had an infection., especially those who have also been vaccinated. They say continued research into vaccine effectiveness results shows vaccination remains the surest way to prevent future COVID-19 infections and serious consequences, including death.

Since the start of the pandemic, more than 63,500 New Yorkers have died from COVID-19. The researchers say he found that vaccination and prior infection provided protection against future infection and hospitalization.

The NYSDOH study also contains new data on reinfections, which was conducted in collaboration with researchers from the California Department of Public Health and the Centers for Disease Control and Prevention and published in the Morbidity and Mortality Weekly Report. from the CDC.

The study is based on more than 32 million adults who have had at least one COVD-19 test, grouped as follows:

  • Group 1 – Unvaccinated with no prior lab-confirmed COVID-19 diagnosis
  • Group 2 – Vaccinated (14 days after completion of a series of primary COVID-19 vaccinations) with no previous diagnosis of COVID-19
  • Group 3 – Unvaccinated who survived a previous diagnosis of COVID-19
  • Group 4 – Vaccines who survived a previous diagnosis of COVID-19

During the study period from May 30 to November 20, 2021, new cases of COVID-19 in both states were highest among unvaccinated people with no previous diagnosis of COVID-19 compared to the other three groups. The researchers noted that after the Delta variant became prominent in late June and July, case rates were lower among those vaccinated without a prior diagnosis of COVID-19. The lowest they say among the two groups with a previous diagnosis of COVID-19.

For example, in New York State, starting the week of October 3, unvaccinated people with no previous diagnosis of COVID-19 were 4.5 times more likely to test positive for COVID-19 than people vaccinated without a previous diagnosis of COVID-19. The 1 versus 2 group was 14.7 times more likely than unvaccinated people with a previous diagnosis, and the 1 versus 3 group was 19.8 times more likely than vaccinated people with a previous diagnosis of COVID-19 in the group 1 vs 4.

During the same period, compared to unvaccinated people without a prior diagnosis of COVID-19, the number and rates of hospitalizations in California followed a similar trend to the study conducted. The researchers added these findings, in two large states like California and New York, one in six deaths in the United States from COVID-19 through the end of November.

The researchers say this suggests that vaccination protected against infection and related hospitalization, and survival from a previous infection protected against reinfection and hospitalization. These results apply to the period before the emergence of the Omicron variant and the widespread use of booster doses, they say.

To provide the public with ongoing information about reinfections, NYSDOH has also launched a new dashboard with data on COVID-19 reinfection in New York State. The Department has also launched a pioneering initiative dashboard on groundbreaking data after the publication of his study on the effectiveness of the vaccine last year.