>Checked the latest literature and cross-reactive antibodies have not demonstrated correlation with either preventing infection or hospitalization. [0] [1] The

>Checked the latest literature and cross-reactive antibodies have not demonstrated correlation with either preventing infection or hospitalization. [0] [1] The sample size of this study was only 251 people, apparently all from France, according to a comment on the study, though I could not confirm or deny that fact from searching through the source text. In order to rule out cross reactivity, we'd need a much larger study comparing samples across many regions.