Several studies have linked sudden hearing loss to the vaccine, with the most comprehensive study coming from France. Four hundred cases of post-vaccine sudden sensorineural hearing loss were evaluated, with 345 medical reports assessed by two audiology experts for potential causality. "[Sudden sensorineural hearing loss] after COVID-19 mRNA vaccines are very rare adverse events," the French authors concluded, adding that these rare adverse events "do not call into question the benefits of mRNA vaccines but deserve to be known given the potentially disabling impact of sudden deafness."