Israel is offering 3rd pfizer shot after infection spikes in fully vaccinated cases.

https://sg.news.yahoo.com/israel-offers-pfizer-covid-19-081910087.html

I don't think the 3rd shot of the same vaccine will protect people from getting infected.  A new vaccine must be developed to deal with this variant.

It looks like the scientists are right as they've stated that the current vaccines (US, UK and China) will likely be ineffective in less than 1 year.

http://sg-stock.blogspot.com/2021/03/scientists-current-vaccines-could-be.html