The BA.4 and BA.5 sub-variants of Covid-19 are more severe than other sub-variants of the Omicron strain, and less affected by antibodies, according to the Department of Medical Sciences.
Director-general Supakit Sirilak said in his weekly update on the BA.4 and BA.5 situation on Monday that BA.4 and BA.5 cases had grown steadily in Bangkok over the past four weeks, from 12% to 50%, 68% and 72% of examined cases.
