D. Cavanagh et Pj. Davis, SEQUENCE-ANALYSIS OF STRAINS OF AVIAN INFECTIOUS-BRONCHITIS CORONAVIRUS ISOLATED DURING THE 1960S IN THE UK, Archives of virology, 130(3-4), 1993, pp. 471-476
Sequencing of parts of the spike, small membrane, and integral membran
e protein genes of English isolates of avian infectious bronchitis vir
us (IBV) isolated in the 1960s revealed that they were not the direct
ancestors of those isolated in the 1980s.