As of last known multiple variants of the SARS-CoV-2 virus, which causes COVID-19, had been identified. Variants such as Alpha, Beta, Gamma, and Delta had been closely monitored due to their potential impact on transmission, severity, and vaccine efficacy.

However, for the most recent and accurate information on COVID-19 variants, I recommend checking reliable and up-to-date sources such as the World Health Organization (WHO), the Centers for Disease Control and Prevention (CDC), or other relevant health authorities. The situation with COVID-19 is dynamic, and new variants may emerge over time.

• Monitoring variants is crucial for understanding the virus's evolution and adapting public health measures and vaccination strategies accordingly. Vaccination remains a critical tool in controlling the spread of the virus and mitigating the severity of illness.
• It's important to stay informed about the latest developments, follow public health guidelines, and get vaccinated to protect yourself and others. 
• As the situation may have evolved since my last update, checking the latest news and official health sources is essential for the most accurate and current information on COVID-19 variants.