Naturally-acquired cell-mediated immunity is probably broad (works against variants) and durable (lasts a long time): https://www.cell.com/cell-reports-medicine

Naturally-acquired cell-mediated immunity is probably broad (works against variants) and durable (lasts a long time): https://www.cell.com/cell-reports-medicine/fulltext/S2666-3791(21)00203-2 https://www.cell.com/cell-reports-medicine/fulltext/S2666-37...