LONDON, Feb 15 (Reuters) - Britain cannot yet exactly saywhat the effect of COVID-19 vaccines is on the incidence of thepandemic but there is interesting data coming from Israel, PrimeMinister Boris Johnson told a news conference on Monday.
"We're unable at the moment... precisely to quantify whatthat means in terms of driving down the incidence of thepandemic in this country, how fast that can go. That's why wejust have to be cautious at the moment," he said.
"There's some interesting data from Israel."(Reporting by Guy Faulconbridge; writing by Costas Pitas)