A study found people with long COVID symptoms were twice as likely to have lingering SARS-CoV-2 proteins in their blood, suggesting a persistent viral reservoir may drive some ongoing symptoms. Researchers analyzed blood from 706 individuals and found that 43% of those with multisystem long COVID symptoms had viral proteins present months post-infection, compared to 21% of those without symptoms. This discovery hints at potential benefits from antiviral treatments for those with persistent symptoms. However, the study also reveals that not all long COVID cases show persistent viral proteins, indicating other causes may contribute to this complex condition.