Texas Attorney General Ken Paxton has filed a lawsuit against Pfizer Inc. for allegedly misrepresenting the efficacy of its COVID-19 vaccine and attempting to censor public discourse. The lawsuit claims Pfizer engaged in deceptive practices by promoting the vaccine's 95% efficacy based on relative risk reduction, which is considered misleading. It also accuses Pfizer of suppressing information about the vaccine's limited duration of protection and failing to measure its effect on transmission. The lawsuit alleges that Pfizer tried to silence critics when the vaccine's limitations became apparent.