The Omicron variant is a strain of the SARS-CoV-2 virus, which causes COVID-19. First identified in late 2021, it has a high number of mutations in its spike protein, leading to increased transmissibility compared to earlier variants. This means it spreads more easily among people. Health authorities have monitored the Omicron variant closely due to its potential impact on vaccine effectiveness and public health measures. While it can cause illness, many studies suggest that vaccines still provide significant protection against severe disease and hospitalization related to this variant.