According to the article, the researcher who "knows the flu-vaccine literature better than anyone else on the planet" calls the vast majority of studies "deeply

According to the article, the researcher who "knows the flu-vaccine literature better than anyone else on the planet" calls the vast majority of studies "deeply flawed" and "rubbish." Only four studies were properly designed to pin down the effectiveness of flu vaccine, he says, and two of those showed that it might be effective in certain groups of patients, such as school-age children with no underlying health issues like asthma; the other two showed equivocal results or no benefit.