Thai health authorities are keeping a close eye on two new Omicron subvariants – BA.4 and BA.5 – that are fast becoming dominant COVID-19strains across the world. Dr Supakit Sirilak, who leads the Department of Medical Sciences, said BA.4 and BA.5 accounted for 51.7 percent of all COVID-19 infections in Thailand between June 25 and … Continue reading Omicron’s new BA.4, BA.5 subvariants: How worried should we be?