Two new Omicron sub-variants, BA.4 and BA.5, still have not been detected in Thailand, Ramathibodi Hospital’s Centre for Medical Genomics (CMG) says. The centre wrote in a Facebook post on Tuesday that it was aware of World Health Organization (WHO) concerns over the new Omicron sub-variants which could be more transmittable and cause more severe symptoms. It said the WHO is now monitoring six Omicron sub-variants: BA.1, BA.1.1, BA.2, BA.3, BA.4 and BA.5. BA.4 and BA.5 sub-variants have a genetic code close to BA.2, with only approximately two additional mutations from BA.2: L452R, correspondi…

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