Results of post-exposure BNT162b2 prophylaxis towards SARS-CoV-2 infections

In a research just lately printed on the medRxiv * preprint server, researchers recognized proof of post-exposure vaccination to decrease the 2019 coronavirus illness (COVID-19) dying fee. The researchers concluded that post-exposure prophylaxis efficiently decreased dying charges related to extreme acute respiratory syndrome coronavirus 2 (SARS-CoV-2).

Research: BNT162b2 Publish Publicity Prophylaxis Towards COVID-19. Picture supply: Rido / Shutterstock


A number of medication have been used to deal with COVID-19 akin to remdesivir, nirmatrelvir, dexamethasone, anti-interleukin-6 receptor antibodies, and sure investigational medication akin to molnupiravir. Nonetheless, these remedy methods solely result in suboptimal therapeutic responses to SARS-CoV-2 infections. Subsequently, additional therapeutic interventions are wanted to scale back COVID-19-associated mortality.

Publish-exposure vaccination prophylaxis is a possible scientific method to COVID-19 that has beforehand been used towards sure ailments. The post-COVID-BNT162b2 vaccination is of excellent significance as a result of decreased immunity after the BNT162b2 vaccination. Nonetheless, thus far no research have been printed investigating post-exposure BNT162b2 vaccination prophylaxis in COVID-19.

In regards to the research

Within the current observational research, the effectiveness of the post-exposure BNT162b2 prophylactic method versus scientific outcomes of COVID-19 was estimated utilizing nationwide surveillance information from the Israel Ministry of Well being (MoH) registry. The research included Israeli residents aged 12 and over who had been polymerase chain response (PCR) constructive for SARS-CoV-2 for the primary time because the vaccination marketing campaign started between December 20, 2020 and October 7, 2021.

Participant information on gender, age, and date of first constructive PCR, hospitalization, discharge, and dying had been collected from the database. The participant’s id was stored confidential and the research was exempt from the requirement of consent. Those that grew to become PCR constructive at or after six days after the primary dose of vaccine had been excluded.

Unintentional post-exposure prophylaxis in just lately vaccinated sufferers who grew to become SARS-CoV-2-PCR constructive on the identical day or in the course of the 5 consecutive days after vaccination (Group 1) was in comparison with the unvaccinated management lot (Group 2).

The management group was shaped by matching group one with the unvaccinated individuals utilizing variables akin to age, gender, first constructive PCR date, hospitalization date, and date of COVID-19-associated dying.

Research outcomes primarily centered on SARS-CoV-2-associated dying inside 60 days of the primary constructive PCR date, hospitalization within the division designated for COVID-19 between two days earlier than and 21 days after the PCR constructive date and size of hospital keep.


The outcomes confirmed that among the many 271,710 Israeli residents who acquired the BNT162b2 vaccine (Pfizer), 11,690 individuals had constructive PCR outcomes on the identical day or inside 5 days of vaccination, representing Group 1 or the group with just lately injected vaccination. No variations in demographics had been noticed after teams one and two had been introduced collectively.

The COVID-19-associated mortality fee within the contaminated 55-year-old or older group as much as 60 days after the primary constructive PCR was considerably decrease in group one than in group two, in all intercourse and age teams.

The mixed group of women and men aged 65 years or older reported 143 and 280 deaths, respectively, amongst 1,413 just lately vaccinated and unvaccinated individuals with an odds ratio (OR) and a 95% confidence interval (CI) of 0.46 and 0.46, respectively 0.36-0.57.

A big discount in mortality was noticed within the mixed age group 55 to 64 years previous, with 8 and 43 deaths amongst 1,322 just lately vaccinated and unvaccinated controls, with OR and 95% CI of 0.18 and 0.07-0, respectively. 39.

Within the age group 55 years or youthful, the dying fee was very low and a statistically important distinction was noticed between the vaccinated and management teams.

The mixed group of women and men ages 12 and 55 reported 10 and 22 deaths among the many 8955 just lately vaccinated and unvaccinated teams, with OR and 95% CI of 0.45 and 0.19-0.99, respectively. When the individuals within the 12- and 55-year-old teams had been analyzed individually, no important variations in mortality charges had been noticed as a result of low incidence of dying in these teams.

Hospital admissions for the mixed group of each sexes aged 65 years or older had been 321 and 430 amongst 1,413 just lately vaccinated and management teams, with ORs and 95% CI of 0.67 and 0.57-0.80, respectively. Equally, hospitalization within the 55-64 yr previous mixed teams was 81 and 115 in 1,322 topics within the research and management teams, with ORs and 95% CI of 0.69 and 0.50-0.93, respectively.

The vaccination standing had no important affect on the size of keep within the hospital. Male and aged sufferers had longer hospital stays.


The research outcomes confirmed that using post-exposure BNT162b2 vaccine prophylaxis decreased COVID-19-associated mortality by 50%, particularly in older high-risk sufferers.

Publish-exposure vaccination confirmed a discount in SARS-CoV-2-associated extreme respiratory signs akin to low saturated oxygen (

*Essential NOTE

medRxiv publishes preliminary scientific studies that haven’t been peer reviewed and due to this fact shouldn’t be thought of conclusive, that information scientific follow / health-related habits or ought to be handled as established data.

Journal reference:

  • Zohar Shemuelian, Yehuda Warszawer, Omri Or, Sagit Arbel-Alon, Hilla Giladi, Meytal Avgil Tsadok, Roy Cohen, Galit Shefer, Antonello Maruotti, Giovanna Jona Lasinio, Eithan Galun. (2022). BNT162b2 Publish-exposure prophylaxis towards COVID-19. medRxiv. doi: material/10.1101/2022.01.07.22268869v1

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