Delays and cost overruns caused Israel's early attempts at creating a vaccine to be abandoned
Prof Shapira, interviewed on Israeli TV, later castigated by Health Ministry for his criticism of the Pfizer shot
The fourth dose campaign was part of Israel's strategy to tackle the fifth wave
Over 100,000 Israelis have already received or registered for second booster in the last two days
The decision was announced on prime time news on Wednesday
Health officials have adopted a softer tone when it comes to children and promised not to "force" the shot for this age group
A previous Israeli study showed that the booster was 92% effective in preventing serious illness
The vaccine, known as Brilife, is in third-stage clinical trials