Yes Partington I'm sure that's right. When used as a booster, a 50% dose of Moderna was found to increase antibodies by x 38 whilst a full dose x 84, (figures from memory but close!)
So a 50% dose was widely advised with possible side effects in mind.
I had a 50% Moderna booster in Chantaburi in February and caught a second dose of Covid in the UK in May, but mild symptoms only.
Now there is a new Moderna vaccine targeting BA5 variant but I doubt that has reached Thailand yet.
I just had a 4th in the UK but Pfizer again this time as the 50% Moderna didn't agree with me. But a Friend, 96, had a 100% booster and he was fine.
Good luck.
