The government completely messed up the messaging for the Astra Zeneca vaccine, a lot of people think it is very risky due to the reports of blood clotting (which are actually lower than for most common medicines!!). It doesn't matter though because even the AZ vaccine is hard to get, you need to be over 40 or have medical reasons and even then you need an appointment. EDIT: And you can't even leave the country without government permission so its not like you can fly a country with vaccine availability to get it.