There’s been a lot of panic with stories of people getting COVID-19 twice and rapidly plummeting antibody levels. But there may be a real bright spot here.
Here’s a good summary article in the Atlantic. Here’s a Science piece on T-cell mediated immunity. Here’s a pre-print on antibody-vs-T-cell response within families exposed to SARS-CoV2. Here’s a reference on T-cell inducing vaccines and BCG.