COVID-19 vaccine for their first dose can get either the Pfizer or Moderna vaccine for their second shot.In a release Monday the province said anyone who received a first shot of any vaccine on or before April 8 is now eligible to book for their second shot. ‘It’s extremely stressful’: Manitobans wait in limbo for more AstraZeneca doses Those who got the AstraZeneca vaccine can get any mRNA vaccine, provided they meet provincial eligibility criteria, including that they got their first shot a minimum of 28 days previously.Health officials have said those making appointments need to know which vaccine they first received, and the date the dose was given.