XBB is a hybrid version of two strains of the BA.2 form of Omicron

The variant was first detected in August 2022 in India, and has been detected in more than 17 countries since then, including Australia, Bangladesh, Denmark, India, Japan and the U.S.

XBB is thought to have the best ability to evade antibody protections of these newly emerged COVID variants

Study said that the new strains of Omicron, and XBB in particular, “are the most antibody-evasive strain tested, far exceeding BA.5 and approaching SARS-CoV-1 level.”

the vaccine and having previously had COVID-19 are not thought to offer the same level of protection against XBB as they have with previous strains of COVID-19. Antibody drugs like Evusheld and bebtelovimab may also not be very effective against XBB

XBB variant symptoms; Fever or chills, Cough, Shortness of breath or difficulty breathing, Fatigue, Muscle or body aches, Headache, New loss of taste or smell, Sore throat, Congestion or runny nose Nausea or vomiting, Diarrhea