The US has not yet determined its criteria for releasing COVID-19 vaccines to other countries, but it would take into consideration infection numbers, healthcare system capacity and vaccination rates, American Institute in Taiwan (AIT) Director Brent Christensen said yesterday. Christensen made the remarks after giving a virtual farewell speech, as he is to leave his post in July after three years of service. US President Joe Biden has said that his administration would release millions of AstraZeneca vaccine doses to other countries, but local media have expressed concerns over the US’ standards for selecting recipient nations and whether Taiwan would be among