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- [6] PATHOLOGICAL, ULTRASTRUCTURAL AND IMMUNOHISTOCHEMICAL CHANGES CAUSED BY LELYSTAD VIRUS IN EXPERIMENTALLY-INDUCED INFECTIONS OF MYSTERY SWINE DISEASE [SYNONYM - PORCINE EPIDEMIC ABORTION AND RESPIRATORY SYNDROME (PEARS)] (REPRINTED FROM THE VETERINARY QUARTERLY, VOL 13, PG 137-143, 1992) IRISH VETERINARY JOURNAL, 1993, 46 (02) : 73 - 77