Please provide a citation for your claim of 40% effectiveness.
Not my claim... and it is widely known and repeated. Here is a link From MSN...probably one of government approved outlets of news on Covid... that you might actually pay attention to. It is heavily sugar coated.
“But against the delta variant, both are likely to struggle. Preliminary data from the Israeli Ministry of Health suggests that Pfizer's vaccine could be only 39% effective at preventing symptomatic infections from the variant”
“If that sounds like bad news for Pfizer and Moderna shareholders, it isn't. The vaccines made by Johnson & Johnson (NYSE: JNJ) and AstraZeneca (NASDAQ: AZN) appear to perform even worse against the variant. In fact, they're suspected of performing so much worse that public health officials in places like Italy are allowing certain people who have received jabs of these two vaccines to get booster shots of Pfizer or Moderna. This hodgepodge vaccination solution is supported by a growing body of evidence, and it's bad news for AstraZeneca as well as Johnson & Johnson.”