To establish causality, Peiris’s team tested blood serum from SARS patients (because it would contain antibodies) against the newfound virus in culture. This was like splashing holy water at a witch. The antibodies recognized the virus and reacted strongly. Less than a month later, based on that evidence plus other confirming tests, Malik Peiris and his colleagues published a paper cautiously announcing this new coronavirus as “a possible cause” of SARS.
