COVID-19 immunity has often been misunderstood as broadly protective against other coronaviruses, including those that cause the common cold. While SARS-CoV-2 belongs to the same viral family as seasonal coronaviruses, immune protection does not spread evenly across that group. Instead, immune memory formed through infection or vaccination remains sharply focused on COVID-19 itself.
Large immune-profiling studies now show that antibodies and T-cells generated by COVID-19 exposure barely strengthen defenses against long-circulating strains like OC43 or 229E. This explains why people continue catching colds after vaccination and why COVID-19 has settled into circulation without displacing other coronaviruses.
