Washington Post

Vaccine companies reveal their study designs, even as Trump sows confusion

Foto: AFP.

WASHINGTON - President Donald Trump stood before a televised audience Wednesday and proclaimed that "results are very good" for vaccines targeting the novel coronavirus. A day later, Moderna and Pfizer, two front-runner drug companies developing a shot, released the full rule books for their studies, revealing that no one yet knows conclusively whether a vaccine is safe and effective - not even company executives.

Trump's imprecise, extemporaneous comments about vaccines have frequently clashed with messages from government officials, outside scientists and companies. That discord has intensified concerns that political pressure will force a vaccine to be prematurely approved but also has sown public confusion as important public health messages have become entangled with politicians' appeals to voters and companies' communications to shareholders...

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