Prior to the emergence of koi herpesvirus (KHV), cyprinid herpesvirus (CHV) was the only pathogen known to cause herpesviral diseases in common carp and koi Cyprinus carpio 1,2). In 1998, a newly recog nized virus, KHV was isolated in Israel and the USA, and shown to be pathogenic for koi and common carp of all ages. It can cause 80-100% mortality, mainly with se vere hyperplasia and necrosis of gill epithelia and necro sis of other organs3). Later, outbreaks of KHV disease were reported in the United Kingdom, Germany, Japan and were suspected in Indonesia*1,*2,*3,*4) by 2003. Recently, due to the large ca•`277 kbp genome

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ABSTRACT. An abortion storm associated with acute neosporosis involving 18 cattle was observed in a dairy farm in Taiwan. Aborted fetus age ranged from 3 to 8 months. Of the 38 cattle in that farm examined during the abortion storm, 52.6% (20/38), 13.2% (5/38) and 10.5% (4/38) contained both IgG and IgM, only IgG and only IgM antibodies to Neospora caninum, respectively. No antibody to N. caninum was detected prior to the abortion storm. Follow-up study conducted a year later showed that 23 out of 28 cattle had seroconverted. Since some cattle were positive to either only IgG or IgM, we suggest that both IgG and IgM should be tested for diagnosing neosporosis. Neosporosis surveillance of naive cattle herd is recommended. KEY WORDS: abortion storm, neosporosis,Taiwan.