I have been loosely following this and I believe that CAL.20C is a variant of B.1.426 if anyone is looking to dig into it deeper...
the CAL.20C strain may be partially responsible for the magnitude of the surge in COVID-19 on the West Coast of the US. The S protein L452R mutation is within a known receptor binding domain that has been found to be markedly resistant to certain monoclonal antibodies to the spike protein(4). Mutations in this domain may be resistant to polyclonal sera as seen in convalescent patients or those post vaccination(5). The functional effect of this mutation in concert with other detected mutations in CAL.20C, both in terms of infectivity and antibody resistance is unknown at this time
source: https://www.medrxiv.org/content/10.1101/2021.01.18.21249786v1.full-text
the CAL.20C strain may be partially responsible for the magnitude of the surge in COVID-19 on the West Coast of the US. The S protein L452R mutation is within a known receptor binding domain that has been found to be markedly resistant to certain monoclonal antibodies to the spike protein(4). Mutations in this domain may be resistant to polyclonal sera as seen in convalescent patients or those post vaccination(5). The functional effect of this mutation in concert with other detected mutations in CAL.20C, both in terms of infectivity and antibody resistance is unknown at this time
source: https://www.medrxiv.org/content/10.1101/2021.01.18.21249786v1.full-text