Human–Bovine Plagues in the Early Middle Ages

Two independent molecular clock analyses (mca s) reveal that measles (mv ) diverged from rinderpest (rpv ) c. 1000 c .e . This evidence, when conjoined with written accounts of non-Justinianic plagues in 569–570 and 986–988 and zoo-archaeological discoveries regarding early medieval mass bovine mortalities, suggests that a now-extinct morbillivirus, ancestral to mv and rpv , broke out episodically in the early Middle Ages, causing large mortalities in both species. Tentative diagnoses of an mv–rpv ancestor help to untangle early medieval accounts of human–bovine disease and facilitate an assessment of the consequences of the 569–570 and 986–988 plagues.