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Official papers unearthed by the National Archives reveal the prime minister's frustration and concern over slow progress securing supplies of what was then seen to be a brand new "wonder drug".

“Tamiflu works for bird flu. It’s not a super powerful drug for regular flu, so it’s probably not going to be a wonder drug for the bird flu,” said Dr. Melanie Ott, a virologist at UC San Francisco.

Indeed, it's often described as a "wonder drug."

The medicine kept her happy and well with few side effects, and she described it as a wonder drug.

Lecanemab is not a “wonder drug”.