The United States has formally withdrawn from the World Health Organization (WHO), a move criticized by public health experts who warn of increased risks to global safety and health. This decision follows a trend initiated by the Trump administration, which accused the WHO of straying from its core mission. In stark contrast, California has become the first state to join a WHO-coordinated international health network, signaling its commitment to global health collaboration despite the U.S. exit. WHO officials expressed regret over the U.S. decision and stated that the reasons for withdrawal presented by the U.S. were untrue. The implications of this withdrawal on public health, particularly concerning flu epidemics and future pandemics, remain a major concern.