Pfizer Vaccine only 42% effective with Delta variant Breakthrough cases.

The vast majority of breakthrough cases will not be severe.

Moderna is 72% effective against Delta breakthroughs.

Booster shots will be available to those who are immunocompromised, and, possibly, to the elderly.

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ElwoodBlues · M

Do you have a link to the data that supports your claim? Others have reported much different numbers:

In Britain, researchers reported in May that two doses of the Pfizer-BioNTech vaccine had an effectiveness of 88 percent protecting against symptomatic disease from Delta. A June study from Scotland concluded that the vaccine was 79 percent effective against the variant. On Saturday, a team of researchers in Canada pegged its effectiveness at 87 percent.

And on Monday, Israel’s Ministry of Health announced that the effectiveness of the Pfizer-BioNTech vaccine was 64 percent against all coronavirus infections, down from about 95 percent in May, before the Delta variant began its climb to near-total dominance in Israel.

Source: https://www.nytimes.com/2021/07/06/science/Israel-Pfizer-covid-vaccine.html