Genomic monitoring unveils a high prevalence of SARS-CoV 2 Omicron Variant in vaccine breakthrough cases in Bahia, Brazil
Campos, G. S.; Giovanetti, M.; de Moraes, L.; da Hora, H. S.; Alcantara, K. M.; Sardi, S. I.
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Genome sequencing proved to be an excellent tool to monitor the molecular epidemiology of the disease caused by SARS-CoV-2, i.e., coronavirus disease (COVID-19). Some reports of infected, vaccinated individuals have aroused great interest because they are primarily being infected with circulating variants of concern (VOCs). To investigate the cases of infected, vaccinated individuals in Salvador, Bahia, Brazil, we performed genomic monitoring to estimate the magnitude of the different VOCs in these cases. Nasopharyngeal swabs from infected (symptomatic and asymptomatic), fully vaccinated individuals (n=29) who were of varying age and had RT-qPCR Ct values of [≤]30 were subjected to viral sequencing using Nanopore technology. Our analysis revealed that the Omicron variant was found in 99% of cases and that only one case was due to the Delta variant. Infected, fully vaccinated patients have a favorable clinical prognosis; however, within the community, they become viral carriers with the aggravating factor of viral dissemination of VOCs not neutralized by the vaccines.
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