Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is an enveloped, positive-sense, single-stranded RNA virus that causes coronavirus disease 2019 (COVID-19). BF.15 is a subbranch of Omicron subvariant BA.5.2.1. The spike protein comprises an N‐terminal S1 subunit and a C‐terminal membrane proximal S2 subunit. The spike glycoprotein is a homotrimer present on the surface of the coronavirus that plays a vital role in recognition of human host cell surface receptor angiotensin‐converting enzyme‐2 (ACE‐2). This recognition is required for fusion of viral and host cellular membranes for transfer of the viral nucleocapsid into the host cells.