The world is now in the third year of the COVID-19 pandemic. As such, enormous volumes of virological, immunological, and epidemiological knowledge pertaining to the SARS-CoV-2 infection have been obtained during these years. The SARS-CoV-2 Omicron variant is currently causing the latest wave of infection globally presumably due to its ability to transmit with ease among individuals and to escape from the existing neutralizing antibodies. Fortunately, numerous treatment agents as well as prophylactic vaccines are now available, thus providing people with a better chance to control this infectious disease. This review will discuss the Omicron variant of concern as well as the available treatments and vaccines for COVID-19.