Mothership.sg ran this headline:
Moderna's Covid-19 shot 93% effective, 6 months after 2nd dose However, Pfizer reported that their shot efficacy would reduce to around 84 per cent over the same time period. [...]
Reuters reported that Moderna data compares favorably to that released by Pfizer and BioNTech last week in which they said their vaccine's efficacy waned around 6% every two months, declining to around 84% six months after the second shot.
Predictably though, the data comes from different studies. Is this a fair comparison (given that efficacy depends on the likelihood of infection etc., so may vary with the sample)?
(N.B.: off the top of my head it's not entirely implausible given that Moderna's vaccine delivers about 3 times as much mRNA per dose, but then there are numerous other factors to consider.)