Den thailandske medicinalproducent [[Siam Bioscience]] (ejet af kong [[Vajiralongkorn]]) blev valgt af AstraZeneca som licensfremstiller for [[ASEAN]]-regionen af Covishield-vaccinen, også kaldt [[COVID-19-vaccine|AZD1222]]. Siam Bioscience begyndte produktion i [[december]] [[2020]], men vaccinen skulle først godkendes. Fabrikkens kapacitet er 15-20 millioner doser pr. måned, og omkring 200 millioner pr. år.<ref>{{cite news |url=https://www.khaosodenglish.com/news/crimecourtscalamity/2021/01/03/thailand-to-get-oxford-astrazeneca-covid-vaccines-by-may/ |title=THAILAND TO GET OXFORD-ASTRAZENECA COVID-19 VACCINES BY MAY |work=[[Khaosod English]] |date=3. januar 2021 |access-date=10. januar 2021 |language=en |archive-url=https://web.archive.org/web/20210103190558/https://www.khaosodenglish.com/news/crimecourtscalamity/2021/01/03/thailand-to-get-oxford-astrazeneca-covid-vaccines-by-may/ |archive-date=3. januar 2021 |url-status=dead}}</ref><ref>{{cite news |url=https://www.thaipbsworld.com/siam-bioscience-was-selected-by-astrazeneca/ |title=Siam Bioscience was selected by AstraZeneca |work=[[Thai PBS]] |date=18. februar 2021 |access-date=23. februar 2021 |language=en |archive-url=https://web.archive.org/web/20210218125622/https://www.thaipbsworld.com/siam-bioscience-was-selected-by-astrazeneca/ |archive-date=18. februar 2021 |url-status=dead}}</ref> I [[marts]] 2021 blev fabrikken og den sikkerheds standarder godkendt af AstraZeneca,<ref>{{cite news |url=https://thainews.prd.go.th/en/news/detail/TCATG210318100358693 |title=AstraZeneca Approves Thailand’s Vaccine Factory |work=[[National News Bureau of Thailand]] |date=18. marts 2021 |access-date=18. marts 2021 |language=en |archive-url=https://web.archive.org/web/20210318153931/https://thainews.prd.go.th/en/news/detail/TCATG210318100358693 |archive-date=18. marts 2021 |url-status=dead}}</ref> og de første vacciner leveret i [[juni]].<ref>{{cite news |url=https://www.thaipbsworld.com/health-minister-expects-first-batch-of-thai-made-astrazeneca-vaccine-in-june-thai-pbs-world-tonight-17th-march-2021/ |title=Health minister expects first batch of Thai-made AstraZeneca vaccine in June – Thai PBS World Tonight [17th March 2021] |work=[[Thai PBS]] |date=18. marts 2021 |access-date=18. marts 2021 |language=en |archive-url=https://web.archive.org/web/20210318154245/https://www.thaipbsworld.com/health-minister-expects-first-batch-of-thai-made-astrazeneca-vaccine-in-june-thai-pbs-world-tonight-17th-march-2021/ |archive-date=18. marts 2021 |url-status=dead}}</ref>
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