Spike glycoprotein o loʻo iai i luga o le coronavirus fou ma faigofie ona suia e pei ole Alpha (B.1.1.7), Beta (B.1.351), Delta (B.1.617.2), Gamma (P.1) ma Omicron (B. 1.1.529, BA.2, BA.4, BA.5).

O le nucleocapsid viral e aofia ai le nucleocapsid protein (N protein mo le pupuu) ma le RNA.O le N protein e fai si mautu, o le pito sili ona tele i viral structural proteins ma maualuga le maaleale i le iloa.

Faʻavae i luga o foliga o le N protein, Monoclonal antibody o le N protein e faasaga i le coronavirus fou na filifilia i le atinaʻeina ma le mamanu o le matou suʻega a le tagata lava ia Antigen Test kit ua taʻua o le "SARS-CoV-2 Antigen Rapid Test (Colloidal Gold)" lea e faʻamoemoe mo ole su'esu'ega fa'apitoa ole SARS-CoV-2 Antigen ile fa'ata'ita'iga ole nasal swab in vitro e ala ile su'esu'eina ole porotini N.

O lona uiga, mo le spike glycoprotein mutant strain i le taimi nei e pei o le Alefa (B.1.1.7), Beta (B.1.351), Delta (B.1.617.2), Gamma (P.1) ma Omicron (B.1.1). .529, BA.2, BA.4, BA.5).O le faʻatinoga o le SARS-CoV-2 Antigen Rapid Test (Colloidal Gold) na gaosia e le matou kamupani o le a le afaina.