A new coronavirus (COVID-19) variant, BA.2.86 (nicknamed 'Pirola' on social media) has been reported in the United States and some other nations. It is said to be highly mutated from more recent versions and the Centers for Disease Control and Prevention (CDC) has added it to it watch list after it was added to the WHO's SARS-CoV-2 variant monitoring list.

What is 'Pirola' variant of COVID-19? Experts say it may bypass immunity from vaccine

Do you know someone who has never been infected with coronavirus since the beginning of the pandemic? How did some health professionals avoid falling ill despite daily contact with Covid-19 patients? A study by Sweden's University of Gothenburg may provide some clues.

Hidden immunity: Study gives clues on how some escape Covid-19 infection

People who have been infected with novel coronavirus are as protected against reinfection as those who have received COVID-19 vaccines, according to the latest study.

Coronavirus infection provides as much immunity as vaccines: Study

People who have recovered from Covid-19 may lose their immunity to the disease within months

How long can a person stay immune from COVID-19?