Tuesday, September 26, 2023
HomeMen's HealthAffiliation between SARS-CoV-2 Omicron viral load and vaccination historical past

Affiliation between SARS-CoV-2 Omicron viral load and vaccination historical past

In a latest research posted to the medRxiv* preprint server, the researchers analyzed the affiliation between viral hundreds in extreme acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant an infection and vaccination historical past.

Study: Similar viral loads in Omicron infections regardless of vaccination status. Image Credit: viewimage/Shutterstock
Research: Related viral hundreds in Omicron infections no matter vaccination standing. Picture Credit score: viewimage/Shutterstock

Varied research have reported the rising variety of breakthrough circumstances of SARS-CoV-2 Omicron an infection. Therefore, it’s important to grasp the viral load current put up breakthrough infections to establish the suitable measures to manage transmission and develop public well being measures. 

In regards to the research

The current research assessed the correlation between the viral hundreds detected in SARS-CoV-2 Omicron BA.1 and BA.2 sublineage infections and vaccination standing.

The staff carried out SARS-CoV-2 detection assessments on samples obtained between 10 January and seven April 2022. The diagnostic platforms employed within the current research included coronavirus illness 2019 (COVID-19) reverse transcription-polymerase chain response (RT-PCR), the FilmArray respiratory panel 79 2.1 check, the Xpert Xpress SARS-CoV-2 check, and the Lumipulse antigen check. These assessments have been carried out on nasopharyngeal swabs collected from contaminated sufferers.      

One-step quantitative RT-PCR (RT-qPCR) was carried out to detect the presence of SARS-CoV-2 to amplify the degrees of the SARS-CoV-2 nucleocapsid (N) gene. The staff used the human ribonuclease P protein subunit p30 (RPP30) gene as the inner constructive management.

Complete-genome sequencing (WGS) was carried out by reverse transcribing the SARS-CoV-2 genomic ribonucleic acid (RNA) into complementary DNA (cDNA), which was subsequently amplified. Moreover, the TaqMan assay was carried out to detect the SARS-CoV-2 spike proteins in SARS-CoV-2-positive samples.


The research outcomes confirmed that 611 sufferers examined SARS-CoV-2 constructive from 10 January to 7 April 2022. Among the many eligible individuals, 199 have been unvaccinated, 370 obtained two vaccine doses, and 42 obtained three. The median ages for the unvaccinated, two-dose, and the three-dose group have been 14, 44, and 48 years, respectively. Notably, the vaccination standing was according to the age of the vaccinees as older people have been most well-liked for the administration of the third dose.

WGS or the TaqMan assay confirmed that among the many whole variety of individuals, 453 have been contaminated with SARS-CoV-2 Omicron BA.1.1 whereas 158 had BA.2. Amongst those that had obtained their third dose, 15.2% had BA.2 whereas solely 4% had BA.1.1 an infection. General, this indicated that BA.2 may trigger breakthrough infections extra typically than BA.1.1 in boosted people.

RT-qPCR confirmed that the imply viral hundreds ± customary deviation (SD) amongst people contaminated with BA.1.1 and BA.2 have been 5.3 ± 1.4 and 5.4 ± 1.6 in unvaccinated individuals, 5.4 ± 1.5 and 5.8 ± 1.5 within the two-dose group, and 4.6 ± 1.7 and 5.5 ± 1.7 within the three-dose group, respectively. Moreover, the imply cycle thresholds (Ct) ± SD within the BA.1.1 and BA.2-infected people have been 20.5 ± 5.1 and 19.9 ± 5.6 within the unvaccinated group, 20.2 ± 5.1 and 18.4 ± 5.0 within the two-dose group, and 22.5 ± 5.7 and 19.9 ± 6.0 within the three-dose group, respectively. Notably, no substantial variations have been discovered within the viral load or Ct ranges amongst contaminated people with completely different vaccination histories.

Furthermore, the staff assessed the correlation between viral load and age. For people contaminated with the BA.1.1 and BA.2 variants, the correlation coefficients between viral load and age have been -0.023 and  0.129 for the unvaccinated, -0.055 and -0.084 for the two-dose group, and -0.189 and 0.189 for the three-dose group, respectively.

Additionally, the correlation coefficients between Ct worth and age for people contaminated with BA.1.1 and BA.2 have been 0.017 and -0.122 for the unvaccinated, 0.058 and 0.095 for the two-dose group, and 0.195 and -0.159 for the three-dose group, respectively. This indicated that there was no important correlation between viral load and age, irrespective of 1’s vaccination historical past.  


The research findings confirmed that SARS-CoV-2 Omicron-infected people may produce and transmit the infectious virus even after receiving the booster vaccine dose. The researchers consider that isolating sufferers identified with a breakthrough an infection may considerably assist curb the unfold of COVID-19.

*Necessary discover

medRxiv publishes preliminary scientific reviews that aren’t peer-reviewed and, subsequently, shouldn’t be considered conclusive, information scientific observe/health-related habits, or handled as established data.


Most Popular

Recent Comments

error: Content is protected !!