[lvlrsSTI]

Based on his reply, have to take a third jab.

“The good news is that we are very, very confident that a third dose, a booster, will take up the immune response to levels that will be enough to protect against the delta variant,” the executive added

In other words the present Pfizer vaccine is not effective against Delta variant? 

The need to come up with new Pfizer vaccine specifically against Delta variant? 

How about new variants in future? 

More jabs?

it takes a year to pass 3 phase testing to come up with a new vaccine, and by the time the vaccine is ready, many new variants pop up, how to catch up?