Many people infected with SARS-CoV-2 Omicron didn’t realize it


The continual evolution of the extreme acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has resulted within the emergence of a number of variants, such because the Alpha, Beta, Delta, Iota, and Omicron variants. At current, SARS-CoV-2 Omicron variants are dominantly circulating in most nations all through the world. 

Research: Awareness of SARS-CoV-2 Omicron Variant Infection Among Adults With Recent COVID-19 Seropositivity. Picture Credit score: Myriam B /


A few of the components related to the speedy unfold of SARS-CoV-2 variants are excessive transmissibility, capability to flee immune responses elicited by way of pure an infection, and coronavirus illness 2019 (COVID-19) vaccines, lowered use of face masks, and modifications in socializing behaviors.

Different components that may have facilitated the surge in Omicron circumstances embrace the variable efficacy of obtainable vaccines towards this pressure and waning ranges of immunity induced by vaccination.

Though many research on the Omicron variant can be found, the extent of lowered consciousness of a person’s infectious standing, which is perhaps a contributing issue to the worldwide surge in Omicron circumstances, has but to be decided. This is a vital consideration, as earlier research recommend that an outbreak can happen by way of asymptomatic or delicate SARS-CoV-2 infections.

A current JAMA Network Open research reviews on the attention stage amongst people throughout the current Omicron variant surge in numerous city areas of Los Angeles County in California. 

Concerning the research

On this massive observational cohort research, SARS-CoV-2 serological assays had been carried out on members earlier than or after the surge within the variety of Omicron circumstances on this area. All related knowledge on staff and sufferers on the Cedars-Sinai Medical Heart in Southern California was thought-about. 

Cedars-Sinai Medical Heart is an educational medical heart that participated in a longitudinal COVID-19 serological research in Los Angeles County. Among the many 6,385 members enrolled within the supply research, 210 had been chosen with serological proof of current Omicron an infection. Medical histories, SARS-CoV-2 exposures, and signs of all members had been obtained. 

SARS-CoV-2 serological assays had been carried out for all samplesAll members had been subjected to 2 or extra serial anti-nucleocapsid immunoglobulin G (IgG-N) antibody measurements a minimum of one month aside.

The primary IgG-N stage was estimated on the finish of a regional SARS-CoV-2 Delta variant surge on September 15, 2021. Equally, the following measurement was obtained following the primary regional surge of the Omicron variant on December 15, 2021. The present research additionally included adults newly identified with Omicron an infection as of Could 4, 2022.

Research findings

Among the many 210 members of this longitudinal cohort research74 had been males, and 136 had been females whose ages ranged between 23 and 84 years. Total, solely 44% of the cohort demonstrated consciousness of their COVID-19 standing. Subsequently, current seroconversion outcomes indicate that almost all people with Omicron an infection remained unaware of their an infection standing.

People who had been asymptomatically contaminated with the Omicron variant had been principally unaware of their an infection standing. As well as, 10% of the research cohort who skilled delicate signs attributed it to the widespread chilly or one other non-SARS-CoV-2 an infection.

These findings strongly point out that the lack of knowledge of COVID-19 standing, both resulting from comparatively absent signs or lack of well timed testing, led to vital viral transmission inside communities in Los Angeles County.

Each tenth particular person who contracted Omicron an infection remained unaware of their an infection standing. Nonetheless, members who had been employed in Cedars-Sinai Medical Heart confirmed higher consciousness of their Omicron an infection as in comparison with non-employees.

This differential consciousness is perhaps attributed to a compulsory every day COVID-19 screening coverage for workers. Curiously, youthful and male people exhibited comparatively greater consciousness of Omicron an infection. 


The present research supplied an in depth evaluation of Omicron an infection consciousness in a various and populated area of the US for the primary time. A comparatively excessive stage of unawareness was noticed associated to Omicron an infection.

A few of the limitations of the research embrace the usage of assays with restricted technical sensitivity. Thus, seroconversion values may very well be underestimated as in comparison with the true values. Moreover, owing to the modest pattern measurement, researchers did not detect a number of components associated to Omicron an infection consciousness.

Sooner or later, a bigger dataset of signs is required to higher perceive the extent to which seroconversion occasions are asymptomatic or symptomatic. As many of the research members obtained messenger ribonucleic acid (mRNA) vaccines, sooner or later, an identical research contemplating people who obtained non-mRNA vaccines have to be carried out.

Moreover, to extend the generalizability of the outcomes, related analysis have to be carried out in different diversified places.

Journal reference:

  • Joung, Y. S., Ebinger, J. E., Solar, N., et al. (2022) Consciousness of SARS-CoV-2 Omicron Variant An infection Amongst Adults With Current COVID-19 Seropositivity. JAMA Community Open 5(8): e2227241. doi:10.1001/jamanetworkopen.2022.27241.
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