claim: less severe course of covid-19 is associated with elevated levels of antibodies against seasonal human coronaviruses oc43 and hku1
evidence_1: our results indicate that previous infections with seasonal coronaviruses might protect against a severe course of disease.", "patients with critical disease had significantly lower levels of hcov oc43- (p=0.016) and hcov hku1-specific (p=0.023) antibodies at the first encounter compared to other covid-19 patients.")