The problem is that the latest vaccines don’t contain the latest variant - they’re always going to be behind the curve because it takes time to develop them after a new variant emerges.
For example, here in NZ, we’re still giving people the bivalent mix designed for the omicron BA.4/BA.5 variant (and the ones before it) which is now about 2 years old and hasn’t been seen here for about 9 months.
There’s a non-zero level of protection from those vaccines, but they’re not keeping up with the virus in real time.
The problem is that the latest vaccines don’t contain the latest variant - they’re always going to be behind the curve because it takes time to develop them after a new variant emerges.
For example, here in NZ, we’re still giving people the bivalent mix designed for the omicron BA.4/BA.5 variant (and the ones before it) which is now about 2 years old and hasn’t been seen here for about 9 months.
There’s a non-zero level of protection from those vaccines, but they’re not keeping up with the virus in real time.