US drugmaker Pfizer is denying any wrongdoing after a British TV documentary showed a presentation on its behalf had criticized the rival Covid-19 vaccine AstraZeneca as potentially dangerous and unsafe.

Teasers for a Channel 4 Dispatches investigative report, shown Monday, say that a Pfizer presentation described AstraZeneca’s vaccine against Covid-19 as unsafe for patients with compromised immune systems and potentially causing cancer. The speech took place in Canada sometime last year, but it was unclear whether it was a one-off event or if the speaker made the claim multiple times.

The full report, titled ‘Vaccine Wars: The Truth About Pfizer,’ is due to air on Friday.

Pfizer reacted by saying the presentation was “wrongly attributed” to them and was done by a third party. (RT)