Israeli health authorities are considering a 4th shot. They claim immunity from the first 3 shots is waning and in the light of the Omicron variant it may be necessary for people who have been shot 3 times to be shot for the 4th time.

So to all of you who have been shot twice, realize that Omicron is here in Nigeria and you still need to be shot 2 more times. If you have received just 2 shots I guess you are in no better situation than an unvaccinated person so do the needful and if possible travel to Israel to ensure you get shot thoroughly.

Source: https://www.google.com/amp/s/www.nytimes.com/2021/12/23/world/middleeast/israel-weighs-giving-approval-for-4th-vaccine-doses.amp.html