Although the effectiveness of the HPV vaccine is well established, its initial introduction was met with skepticism and caution, amplified by misinformation in various media sources and by non-scientific public figures. A similar scenario occurred when a study published in the peer-reviewed medical journal Lancet suggested a possible link between the MMR vaccine and autism, a link erroneously amplified by one of the paper’s authors, Paul Wakefield. However, it was eventually demonstrated that Wakefield’s study failed to meet scientific standards in which of the following categories?

The study by Paul Wakefield failed to meet scientific standards in terms of methodology and ethical conduct. The study had several major flaws, including small sample size, biased selection of subjects, conflicts of interest, and lack of replication of results by other researchers. Additionally, Wakefield's actions in promoting his findings without sufficient evidence and ethical oversight violated basic scientific principles and contributed to the spread of misinformation about vaccine safety.