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#Antibody response usually protects against infection/re-infection but #Tcells could protect against clinical signs of disease. #COVID19
The paper from #1990 analyzed the antibody response and clinical symptoms of the common cold #coronavirus #229E. Neutralizing antibody titers declined within 1 year after 1st challenge, and 70% from the "immunized" cohort got re-infected but none showed clinical symptoms. 
This most likely explanation is that clinical symptoms were controlled by virus-specific T cells. There is an assumption here that a protective level of antibody would have prevented re-infection in the first plays
