Hybrid alphavirus-SARS-CoV-2 pseudovirus system rapidly measures neutralizing antibodies

Do a person's antibodies work to block the COVID-19 virus from infecting one's system? Are these antibodies also capable of blocking emerging variants such as the omicrons?
Do a person’s antibodies work to block the COVID-19 virus from infecting one’s system? Are these antibodies also capable of blocking emerging variants such as the omicrons?