The etiology of fulminant viral hepatitis was determined in 65 consecutive cases among 1,814 (3.58%) adults with acute viral hepatitis who were admitted to the Infectious Diseases Hospital of Athens from May, 1981 to August, 1983. Radioimmunoassays were used to detect hepatitis B virus, hepatitis A virus and delta-agent markers. Enzyme immunoassay was used to detect anti-HBc IgM. Hepatitis B virus was responsible for 48 (73.9%), non-A, non-B for 16 (24.6%) and hepatitis A virus for one case (1.5%). The use of anti-HBc IgM identified 10 cases of fulminant type B hepatitis among HBsAg negative, anti-HBc and anti-HBs positive patients. Fulminant non-A, non-B hepatitis was superimposed on 10 asymptomatic HBsAg carriers; delta-agent co-infection was diagnosed in two fulminant type B hepatitis cases. These data show that hepatitis B virus is the major cause of fulminant hepatitis in Greece. HBsAg carriers are at high risk for fulminant non-A, non-B hepatitis. delta-agent does not seem to be as important as in Italy and other countries.

Acute Disease↗

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Experimental Haemophilus somnus infection in pregnant cattle.

Of five pregnant cows inoculated intravenously with 5 X 10(8) viable 'Haemophilus somnus', one aborted within 5 days and excreted 'H. somnus' from the vagina for a further 7 weeks. A second cow proceeded to full term parturition but both it and its apparently healthy calf persistently excreted 'H. somnus'. The other animals underwent normal full term calvings and 'H. somnus' was not isolated from them or their calves. Lesions attributable to 'H. somnus' were detected only in the aborted fetus which showed an acute generalized inflammatory cell response consistent with a systemic Gram-negative bacterial infection. 'H. somnus' was isolated from all fetal tissues, including the placenta. The fetus and placenta also showed evidence of damage prior to inoculation. The placental damage may have predisposed the fetus and placenta to infection with 'H. somnus'. The placental epithelial cells contained intracytoplasmic organisms with the morphological and antigenic properties of 'H. somnus'.

Animals↗

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Growth rates and patterns of organs and tissues in the bovine fetus.

Ninety-two purebred Jersey fetuses from clinically normal dams derived from a variety of sources but unexposed to experimental infection, were killed between 80 and 260 days after conception and dissected to provide basic parameters of a normal population. Organs and tissues were weighed and measured and the equations for the regression of the values on fetal age evaluated. Growth followed a sigmoid curve with rapid changes in growth rate between 140 and 170 days' gestation. While a few variables increased their growth rate over the late fetal period, the majority maintained a low even rate of growth. Thyroid and cerebellum weights showed a marked reduction in growth rate at this time. Long bone length and crown-anus length were the most predictable parameters for a given gestational age.

Animals↗

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Experimental Yersinia enterocolitica placentitis in sheep.

A strain of Yersinia enterocolitica of O serogroup 6,30 isolated from the liver of an aborted ovine fetus was inoculated intravenously into a group of pregnant ewes at about 90 days gestation and produced placentitis with abortion or delivery of infected lambs about 50 days later. Y. enterocolitica of the same serogroup was recovered from the necrotic placental cotyledons and most other fetal tissues and could be isolated from vaginal discharges of the ewes for a least 2 weeks after abortion. Histological changes were consistent with an acute bacterial necrotizing placentitis and systemic infection of the fetus. Subsequent pregnancies in the ewes proceeded to term without evidence of infection.

Animals↗

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