ABSTRACT
The Delta variant of concern (VOC) of SARS-CoV-2 has become dominant worldwide. In this article, we report a cluster caused by B.1.617.2 harboring the additional mutation of concern (MOC) F490S. We observed that 5 fully vaccinated subjects aged between 47 and 84 years were infected with this variant. The immune escape mutation F490S, first identified in the Lambda VOI, appears to impair vaccine efficacy and is rapidly increasing in prevalence worldwide.
Subject(s)
COVID-19 , SARS-CoV-2 , Aged , Aged, 80 and over , COVID-19/epidemiology , COVID-19 Vaccines , Humans , Middle Aged , Mutation , SARS-CoV-2/geneticsABSTRACT
The SARS-CoV-2 variant of concern (VOC) "Delta" is currently defined by PANGOLIN as a cluster of 33 different AY sublineages. Delta (in particular B.1.617.2) is largely and rapidly replacing the Alpha VOC as the dominant clade in most countries. To date, variations in the Spike protein of the Delta VOC have largely been limited. We report here the results of a genomic surveillance programme from Northern Italy. We identified several Delta sublineages harbouring mutations previously reported in GISAID at extremely low frequencies and in different combinations. Two patients (one of them vaccinated) tested positive for a Delta sublineage harbouring S71F, T250I, T572I and K854N. More patients tested positive for G769 V plus C1248F, A352S, and R158G and C1248F, respectively. Genomic surveillance of Delta variants should be encouraged to anticipate immune escape and deploy countermeasures.
Subject(s)
COVID-19/epidemiology , COVID-19/virology , SARS-CoV-2/genetics , Spike Glycoprotein, Coronavirus/genetics , Adult , Aged , Evolution, Molecular , Female , Humans , Italy/epidemiology , Male , Middle Aged , Young AdultABSTRACT
The Delta variant of concern of severe acute respiratory syndrome coronavirus 2 is dominant worldwide. We report a case cluster caused by Delta sublineage B.1.617.2 harboring the mutation E484K in Italy during July 11-July 29, 2021. This mutation appears to affect immune response and vaccine efficacy; monitoring its appearance is urgent.
Subject(s)
COVID-19 , SARS-CoV-2 , Humans , Italy/epidemiology , MutationSubject(s)
COVID-19/pathology , SARS-CoV-2 , Thyroiditis, Autoimmune/pathology , Antibodies, Monoclonal, Humanized/immunology , Antibodies, Monoclonal, Humanized/pharmacology , Female , Genome, Viral/genetics , Humans , Italy , Middle Aged , Peru , SARS-CoV-2/drug effects , SARS-CoV-2/genetics , SARS-CoV-2/isolation & purification , Severe Acute Respiratory Syndrome/pathology , Severe Acute Respiratory Syndrome/virology , World Health OrganizationABSTRACT
We report an imported case of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant P.1 detected in an asymptomatic traveler who arrived in Italy on an indirect flight from Brazil. This case shows the risk for introduction of SARS-CoV-2 variants from indirect flights and the need for continued SARS-CoV-2 surveillance.