I've been sent appt for this afternoon covid booster. I've had three pfizers in past and know the centre I'm booked at does both but unsure how tgey sort this out... Stock or set days. I really don't want another Pfizer... I've had three and also had covid in June this year... Can I request a modena? Any advice? Anyone work in vaccines? I don't see the point of another Pfizer when the moderna is tweaked to protect against omicron.