July 14, 2021 published at 1:39 AMReuters A man rides his bike on an almost empty road which is usually crowded with people, as lockdown and travel restrictions are imposed to curb the spread of the coronavirus disease (Covid-19) in Bangkok, Thailand, on July 12, 2021. Reuters BANGKOK - A virologist and advisor to Thailand's government on Tuesday (July 13) endorsed a plan to mix doses of the coronavirus vaccines of AstraZeneca and Sinovac, amid some public unease about use of the largely untested strategy. There has been no research released specifically about mixing the two types, but a growing number of countries are looking at mix-and-match approaches to better protect from highly transmissible variants, the latest, Thailand's neighbour, Vietnam.