> You can't generally be reinfected by the same strain. Unless the word "generally" is doing a lot of work in this sentence - YES YOU CAN be reinfected by the

> You can't generally be reinfected by the same strain. Unless the word "generally" is doing a lot of work in this sentence - YES YOU CAN be reinfected by the same strain. It's called "homologous reinfection": the person's natural immune response is not always up to the task of actually providing immunity to a specific viral strain, and that exact same viral strain can reinfect the patient even immediately after recovery. This idea that the human immune response is always 100% effective (assuming the patient survives) is frankly a bizarre misconception: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3863957/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3863957/