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Fact-checked: No, changes in CDC guidelines do not prove vaccinations are ineffective _

Following a leaked internal report from the Centers for Disease Control and Prevention in the USA that suggested that vaccinated people can still transmit COVID-19, social media users and anti-vaccination activists have spread misinformation attempting to undermine public trust in vaccine effectiveness. In some cases, they are falsely claiming that vaccinated people with breakthrough infections carry a greater viral load than is found in the unvaccinated, when in reality the report claims the viral load is similar. Breakthrough cases of COVID-19 in vaccinated people are statistically rare and are far less likely to result in hospitalisation or death compared to cases among those who have not been vaccinated. Politifact has fact-checked these claims.