K. Sadamasu

This study investigates the virological properties of the SARS-CoV-2 HK.3 variant, a FLip variant with substitutions S:L455F and S:F456L, to assess its growth advantage.

This study investigates the virological characteristics of the SARS-CoV-2 BA.2.86 variant, finding it has higher reproduction number than EG.5.1 but lower pathogenicity and replication capacity compared to BA.2.

The paper investigates the virological features of the SARS-CoV-2 EG.5.1 variant, finding its fitness and antiviral sensitivity comparable to XBB.1.5, with structural differences in spike proteins.

This study examines virological parameters of SARS-CoV-2 variants correlating with spike protein fusogenicity, finding strong links with S1/S2 cleavage efficiency and plaque size.

This study evaluates the antiviral efficacy of XBB breakthrough infection sera against EG.5.1 and other Omicron subvariants, finding comparable neutralization titers and suggesting immune evasion is not the main driver of EG.5.1's spread.

This study identifies XBB as a SARS-CoV-2 variant resulting from recombination of BA.2 subvariants, showing increased resistance to neutralizing antibodies and enhanced fusogenicity compared to BA.2.75.

The paper investigates convergent evolution in SARS-CoV-2 Omicron subvariants, identifying five critical spike protein substitutions in BQ.1.1 that enhance viral fitness and antibody resistance.

This study investigates the virological characteristics of SARS-CoV-2 Omicron BA.2.75, finding it has higher transmissibility and pathogenicity compared to BA.2 and BA.5, but similar sensitivity to antiviral drugs.

This study analyzes the virological characteristics of SARS-CoV-2 Omicron variants BA.2.12.1, BA.4, and BA.5, finding they have higher reproduction numbers, reduced neutralization by prior immunity, increased replication in lung cells, and greater pathogenicity in hamsters compared to BA.2.

This study identifies the S375F mutation in the Omicron spike protein as responsible for its reduced cleavage efficiency, fusogenicity, and rapid spread.

This study compares the virological characteristics of SARS-CoV-2 BA.2 and BA.1 variants, finding BA.2 has higher transmissibility, different antigenicity, greater replicative capacity, and higher pathogenicity in hamsters.

This study shows the P681R mutation in the SARS-CoV-2 spike protein enhances fusogenicity and pathogenicity in the Delta variant compared to the prototypic virus.

The paper reports higher seroprevalence of Entamoeba histolytica compared to HIV-1 and syphilis in a Tokyo VCT center, with risk factors including male sex, older age, and syphilis positivity.