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PubMed2002

Nucleotide sequence and construction of an infectious cDNA clone of an EMCV strain isolated from aborted swine fetus.

A full-length cDNA clone of an Encephalomyocarditis virus (EMCV) strain (2887A) isolated from aborted swine fetus was constructed and sequenced. Sequence comparison showed more than 99% nucleotide and amino acid sequence identity with two other EMCV strains, EMCV-PV21 and -R. However, the 2887A genomic sequence showed only about 84% nucleotide identity and 96% amino acid identity with EMCV-B, -D and -PV2 variants. RNA synthesized by in vitro transcription of this cDNA clone was infectious upon transfection of BHK21 cells, as shown by cytopathic effects and identification by neutralization test, and by propagation of the virus released into the culture media. The transcript RNA led to the production of infectious particles despite the presence of two nongenomic nucleotide residues at the 5' end, the short poly(C) tract (C(10)TCTC(3)TC(10)), the short poly(A) tail (7A), and the presence of six nongenomic nucleotides at the 3' end. The rescued virus was also found to be highly pathogenic for mice by intra-peritoneal inoculation producing a fatal disease indistinguishable from that of wild-type virus. An important finding concerning the molecular basis of infectivity was that the in vitro synthesized EMCV RNA transcript is infectious, although it contains a very short poly(A). The availability of the infectious cDNA clone of the reproductive failure strain of EMCV should prove to be useful for studying the molecular basis of the pathogenicity of EMCV in pig.

Abortion, Septic↗
PubMed2000

[Prevalence and distribution of congenital cardiopathy at birth and in pregnancy termination: impact of prenatal diagnosis in 4 years of experience].

OBJECTIVE: To evaluate in two time intervals the potential impact of prenatal diagnosis on prevalence and spectrum of CHD at birth and in aborted fetuses. PATIENTS AND METHODS: At the University Hospital of Bari, south-east Italy, in the period between January 1st 1996 and December 31st 1999 a retrospective study was performed of all newborns and termination of pregnancy (TOP) beyond 18 weeks' gestation with postnatally diagnosed CHD. An antenatal fetal ultrasonic evaluation had been always performed between 18-22 weeks' gestation. The prevalence, distribution and detection rate of CHD at birth and in TOP were assessed and compared between two different periods of time (96-97 vs 98-99) to verify an eventual improvement in the prenatal diagnosis due to the learning curve and to new technologies. RESULTS: Prevalence of severe CHD in livebirths and aborted fetuses showed no significant changes between the two study periods (respectively 4.6@1000 vs 5.4@1000, at birth; 10% vs 11%, in TOP) and the same was observed as for as distribution of CHD. Maternal or fetal risk factors were found in 23% of cases of CHD at birth and in 74% of cases of CHD in aborted fetuses. The antenatal detection rate of CHD did not change between the two study periods in newborns (25% vs 27%, NS) while in aborted fetuses it was higher and showed a significant longitudinal improvement (53% vs 85%, p < 0.05), which was more evident if only selected cases were considered (56% vs 93%, p < 0.03). DISCUSSION: Our data show that gain in experience in fetal echocardiography has increased the prenatal diagnostic accuracy for congenital cardiac malformations only in selected cases, evaluated by more expert operators. In conclusion the impact of antenatal routine screening for congenital heart disease appears still relatively small.

Abortion, Induced↗
PubMed1996

Demonstration of infectious bovine rhinotracheitis virus antigen by immunoperoxidase method in tissues of aborted bovine fetuses preserved for 25 years in paraffin blocks.

Infectious bovine rhinotracheitis (IBR) virus antigen was demonstrated by the immunoperoxidase method in tissues of two aborted bovine fetuses, which had been stored for 25 years after fixing in formalin and embedding in paraffin. Necrotic foci were detected in the liver, kidney, adrenal gland, and thymus of the fetuses. Coincidenting with the distribution of the necrotic foci, IBR virus antigen was demonstrated by immunostaining. The present study proved the immunoperoxidase method in one of useful techniques to demonstrate IBR virus antigen in tissue sections from preserved paraffin blocks.

Abortion, Veterinary↗
PubMed1991

Abortion in Japanese cows caused by Chlamydia psittaci.

An outbreak of abortion in cows occurring in Niigata Prefecture was shown to be caused by Chlamydia psittaci. Elementary bodies characteristic of Chlamydia were found in the liver of aborted fetuses and C. psittaci antigen was demonstrated by indirect immunofluorescence. Chlamydia was isolated from the liver of aborted fetuses by the yolk sac inoculation of developing chick embryos and by the intraperitoneal inoculation of guinea pigs. Abortion occurred mostly in middle or late pregnancy. Aborted fetuses showed subcutaneous edema and gelatinous infiltration, enlarged liver and spleen, and dark red pleural and ascitic fluid. Focal necrosis was shown in the liver, spleen and lymph nodes. Serological findings and isolation of Chlamydia from fecal specimens indicated a wide dissemination of C. psittaci among cows in the area.

Abortion, Veterinary↗
PubMed2002

Diagnosis and outcome of preconceptional and periconceptional primary human cytomegalovirus infections.

Primary human cytomegalovirus (HCMV) infection occurring in pregnant women within 3 months before (preconceptional) or within 4 weeks after (periconceptional) the last menstrual period represents an as-yet-undefined risk to the fetus. One (9.1%) of 11 newborns born to 12 women with preconceptional infection was subclinically infected (1 aborted fetus was not examined for infection). Of 20 pregnancies in women with periconceptional infection, 7 were terminated before 12 weeks of gestation (aborted fetus was not examined), 1 was terminated at 23 weeks after prenatal diagnosis of congenital infection, and 12 continued to term. Of those 12, 3 resulted in newborns who were congenitally infected. Thus, in the periconceptional group, intrauterine transmission occurred in 4 (30.8%) of 13 pregnancies for which the virologic outcome was known. One newborn was symptomatic at birth, and disseminated HCMV infection was diagnosed in an aborted fetus. Periconceptional primary HCMV infection seems to bear a higher risk of unfavorable outcome than preconceptional infection, and counseling should be adjusted accordingly.

Antibodies, Viral↗
PubMed2002

Diagnostic survey of bovine abortion in Korea: with special emphasis on Neospora caninum.

Causes of bovine abortion were surveyed in Korea within a designated period from the cases submitted to the Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University. One hundred and eighty aborted fetuses and maternal sera were evaluated by necropsy, histopathology, bacteriology, virology, PCR, and serologic tests. The causes of abortion were identified in 108 (60%) cases, of which 38 (21.1%) were due to the infection with Neospora caninum. None of the 38 cases showed any co-infection with either virus or bacteria. Viral and bacterial causes were diagnosed in 28 (15.5%) and 13 (7.2%) aborted fetuses, respectively. Non-infectious causes such as multiple pregnancy, maternal weakness or torsion of umbilical cord were observed in 22 (12.3%) cases. Results of the present study suggest that N. caninum is believed to be the leading cause of bovine abortion in Korea. Thus, more attention should be paid to this emerging disease in Korea. However, the causes of many aborted fetuses remain undiagnosed in this study. Therefore, this enigma should be clarified through further studies such as chromosomal analysis.

Abortion, Veterinary↗
PubMed1989

Comparison of enzyme-linked immunosorbent assay, indirect fluorescent antibody test, and direct agglutination test for detecting Toxoplasma gondii antibodies in naturally aborted ovine fetuses.

Results obtained in an enzyme-linked immunosorbent assay (ELISA), an indirect fluorescent antibody test (IFA), and a modified direct agglutination test (MAT) for Toxoplasma gondii antibodies from examination of fetal fluids from 377 aborted ovine fetuses were compared. Sixty-seven samples were positive by MAT (titers 1:16 to greater than 1:65,536), 58 were positive by ELISA, and 62 were positive by immunoglobulin G-IFA. The MAT was preferred because it required less time, labor, and special equipment. It was simple to run, could be done on serum from any species without modification, and it was more effective than the IFA for detecting toxoplasma antibodies in severely autolyzed fetuses. No advantage was found in determining immunoglobulin M antibodies in ovine fetal sera.

Abortion, Veterinary↗
PubMed2004

Decreased expression of equine herpesvirus-1 early and late genes in the placenta of naturally aborted equine fetuses.

Intrauterine infection with equine herpesvirus-1 (EHV-1) has been considered to be the consequence of transplacental transmission of the virus following maternal cell-associated viraemia. In this study the state of EHV-1 gene expression in the placenta of seven naturally aborted equine fetuses was examined. Neither lesions nor viral antigens were detected in the placenta of the fetuses. The amount of infectious virus in the placentas was considerably lower than that in the fetal lungs, which showed pneumonia and typical herpesvirus inclusions. Quantitative dot blot hybridization with probes specific for immediate-early (IE), early (ICP0), and late (gD and gK) genes revealed that the placentas expressed the IE gene at a level comparable with that in the lungs; however, expression of the ICP0, gD and gK genes was significantly weaker in the placentas than in the lungs. In-situ hybridization demonstrated that both IE and gK RNAs were distributed mainly in the cytoplasm of trophoblasts. These results suggest that the low level of early and late gene transcription may be related to the limited production of viral progeny and the lack of immunoreactivity for viral antigen in trophoblasts infected with EHV-1.

Abortion, Veterinary↗
PubMed1991

Lesions in aborted bovine fetuses and placenta associated with bovine viral diarrhoea virus infection.

Abortions in dairy cattle were investigated on 55 dairy farms sited in North West England, using a multi-level diagnostic technique. After pathological examination of fetal and placental tissues collected at the time of abortion, possible causes for these abortions could be identified, supported by bacteriological and serological laboratory findings. Of 150 abortions investigated, Bovine Viral Diarrhoea (BVD) virus infection was related to 40 episodes (27% of the total), often accompanied by evidence of concurrent infections. Lesions associated with BVD abortions were found in fetal eyelid, lung, and occasionally myocardium. Lesions in the lung were most consistent, characterized by mononuclear inflammatory cell infiltration of peribronchiolar and inter-alveolar tissues. Placental lesions were non-specific. It is concluded that the lesions observed are insufficient to be the primary cause of abortion. However, the pathological changes associated with BVD infection in the placenta may allow secondary opportunist pathogens to cross the feto-maternal barrier, thereby threatening the health of the fetus and the physiological and endocrinological functions of the placenta which maintain pregnancy.

Abortion, Veterinary↗