Dr Anthony Fauci, the US’s chief medical adviser at the start of the pandemic, has described a book by News Corp investigative journalist Sharri Markson backing the “lab leak” theory of Covid-19’s origins as a “bunch of nonsense” in his newly released diaries. This week, Fauci, 85, was subpoenaed by the Republican senator Rand Paul to appear at a Senate hearing into Covid-19 and his handling of the pandemic. The physician and veteran former director of the National Institute of Allergy and Infectious Diseases, who retired in 2022, accused Paul…