Churches suspended the common cup during the influenza pandemic of 1918 and again in the epidemics of the following century, and intinction and individual glasses spread as a result. This run deliberately made no claim about transmission risk because it could not verify one, and the relationship between what has been measured and what churches actually decided is not established here.
What would resolve this A review of the published microbiological and epidemiological studies of the shared chalice, paired with the actual decisions of church authorities, to establish whether the evidence drove the practice or followed it.
OpenEpidemiology; liturgical studiesDivinity Atlas Open Questions Register, First Edition