Recent evidence suggests T-cell immunity may be more important for long-term immunity with circulating SARS-CoV-2-specific CD8+ and CD4+ T cells identified in 70% and 100% of convalescent patients with COVID-19, respectively.39 Furthermore, 90% of people who seroconvert make detectible neutralising antibody responses that are stable for at least 3 months.55 If the above dynamic causal model is broadly correct, future national lockdowns may be unnecessary. The gene discussed is CD4; the disease is COVID-19.