COVID-19 vaccination lowered the severity of the Omicron-driven pandemic wave in Saudi Arabia

In a contemporary learn about revealed within the Magazine of An infection and Public Well being, researchers performed a retrospective learn about of all coronavirus illness 2019 (COVID-19) circumstances from a unmarried health center within the Kingdom of Saudi Arabia (KSA) between December 25, 2021, and February 30, 2022.

Find out about: COVID-19 vaccine had a vital certain have an effect on on sufferers with SARS-COV-2 all through the 3rd (Omicron) wave in Saudi Arabia. Symbol Credit score: PHOTOCREO Michal Bednarek/Shutterstock

They described the epidemiology and scientific traits of COVID-19 sufferers all through the 3rd pandemic wave when the serious acute breathing syndrome coronavirus 2 (SARS-CoV-2) Omicron variant used to be main.


The KSA had controlled to keep an eye on the unfold of SARS-CoV-2 throughout the nation to a big extent via fashionable vaccination techniques. With the emergence of Omicron, the day-to-day reported circumstances within the KSA surged to 4000/day from not up to 100/day within the previous months.

Even though in comparison to Delta, Omicron led to much less serious infections, fewer hospitalizations, extensive care unit (ICU) admissions, and much-reduced mortality, there used to be an pressing want to review its results within the basic inhabitants.

In regards to the learn about

Within the provide learn about, researchers reviewed all COVID-19 circumstances from a unmarried clinical heart in KSA and amassed knowledge to check the traits of sufferers all through the Omicron wave. This knowledge encompassed their demographics, scientific signs, pre-existing clinical prerequisites, COVID-19 vaccination standing, date of closing vaccination, and SARS-CoV-2 an infection. Additional, the researchers assessed whether or not or no longer those COVID-19 sufferers required health center or ICU admission.

For statistical analyses, they first summarized knowledge as numbers and percentages. They when compared express knowledge the usage of a chi-square take a look at, together with admitted and non-admitted sufferers and gender-based knowledge with different covariates.

A binary logistic regression research helped the researchers style a couple of covariates with admission standing and gender. Moreover, they built a Boxplot of the cycle threshold (CT) values of SARS-CoV-2 opposite transcriptase-polymerase chain response (RT-PCR) with COVID-19 vaccine doses. After all, the crew used Kaplan-Meier curve research to decide the times from the closing COVID-19 vaccine to the next prevalence of SARS-CoV-2 an infection.

Find out about findings

The overall learn about research lined 400 Omicron-infected sufferers, of which 55% have been men, and the rest have been ladies. The commonest pre-existing clinical prerequisites have been diabetes mellitus and high blood pressure, 10.5% and seven.5%. Probably the most putting function of the Omicron wave used to be the considerably decrease hospitalization fee (best 14%) in comparison to prior pandemic waves. Simplest 3.5% and a couple of% of 400 Omicron-infected sufferers required ICU admission and mechanical air flow, respectively.

Additional, it used to be inversely associated with the choice of COVID-19 vaccine doses. In a binary logistic research, whilst health center admission used to be considerably related to headache and sore throat, fever and diabetes mellitus have been inversely related to health center admission.

The commonest signs noticed within the learn about of sufferers contaminated with Omicron have been sore throat, cough, fever, and headache, noticed in 39.8%, 39.5%, 33%, and 30.5% of sufferers, respectively. The scientific presentation and comorbidities didn’t exchange with the affected person’s gender all through the Omicron-driven pandemic wave. Then again, the prevalence of sore throat in a binary logistic regression confirmed the next fee amongst men with an OR of two.014.

Without reference to the vaccination standing, extra Omicron-infected than Delta-infected sufferers skilled sore throats (70.5% vs. 60.8%). Intriguingly, those sufferers additionally had odynophagia; then again, anosmia, a pathognomonic symptom of earlier SARS-CoV-2 variants, used to be markedly low in Omicron-infected sufferers.

Throughout female and male sufferers, the common time to SARS-CoV-2 an infection from the closing vaccination used to be 131.60 days. The common CT price used to be upper within the recipients of 2 or 3 vaccine doses than the recipient of 1 dose of the COVID-19 vaccine; then again, this distinction didn’t succeed in a statistical distinction.

The noticed variations all through other COVID-19 pandemic waves most likely mirrored variations within the learn about inhabitants or the interplay between the criteria and the vaccination.


The present learn about remarkably depicted the epidemiological and scientific traits of COVID-19 sufferers all through the Omicron wave in KSA. That they had a milder illness and required much less hospitalization and no more ICU admission. Since maximum sufferers had won COVID-19 vaccines, it confirmed the significance of COVID-19 vaccination in restricting illness severity and reducing the desire for hospitalization.

Magazine reference:

  • Salma AlBahrani, Ali AlBarrak, TariqAl-Musawi, Nawal Ali AlGubaisi, MaramAlmalki, Fatimah H.Hakami, Turki Alghamdi, Zena AlBeiuruti, Sausan Alkhrashi, Meshael Almershad, Samira Alzahrani, Amerah AlQuraiaan, Helmy AlTourifi, Arulanantham Zechariah Jebakumar, Jaffar A.Al-Tawfiq. (2022). COVID-19 vaccine had a vital certain have an effect on on sufferers with SARS-COV-2 all through the 3rd (Omicron) wave in Saudi Arabia. Magazine of An infection and Public Well beingdoi:

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