New coronavirus strains from visitors arriving from western countries could pose a higher health threat than older strains from tourists arriving from China, according to virologist Yong Poovorawan.
Amid concerns over rising infections with China easing restrictions on travel, Dr Yong wrote on his Facebook account on Friday that China's recent outbreak is predominantly led by the Omicron subvariant of Covid-19, BA.5, which had already spread in Thailand.
