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Background: Polyvinyl chloride (PVC) is used primarily to produce home appliances however, its production without vinyl chloride (VCM) is not reproducible. VCM has harmful effects on liver when is exposed during a long term duration. We surveyed long term liver effects with exposure of mild to moderate amounts of VCM.

 Materials and methods: In this case-control study, liver enzymes levels of 52 workers were compared with 48 staff employees using t-test analysis. Case group was composed of all occupied workers in PVC production unit (one of the petrochemical complex), while, the control group was chosen form administrative staff of the same petrochemical complex.

 Results: The mean level of alkaline phosphatase (ALP) and gamma glutamine trans peptidase (GGT) were shown to be significantly differed between the two groups. Other measures such as AST, ALT, and direct and indirect billirubin were revealed to be higher in case group, however, their difference did not reach a statistically significant level.

Conclusion: Results revealed that exposure to even low levels of VCM may lead to mild liver cholestatic damage, therefore, use of tests for liver cholestasis such as GGT and ALP for individuals working in PVC production units should be kept in mind periodically.

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Background: Primary infection of cytomegalovirus especially in first and second trimester of pregnancy causes severe tissue injury and congenital abnormalities. Infection in third trimester of pregnancy has a higher chance of transmission but less tissue injury. Elisa method is a simple test for diagnosis of serum antibody but blood lymphocytes culture is a better and more specific diagnostic method than Elisa. In this study we compared Elisa and tissue culture methods for the diagnosis of congenital cytomegalovirus infections.
Materials and methods: In this study 5 ml of blood obtained from mothers who aborted their fetuses. Then serum antibody was titrated by ELISA method. Moreover, 5ml of citrated blood with 2 ml of Ficohl hypaque centrifuged in 3000 g and buffy coat layer of leukocytes was separated. These cells cultured in MRC5 fibroblast cell line and were assessed for intracellular inclusion bodies after 72 hours. Positive samples were selected and tested for nucleic acids of cytomegalovirus with PCR method.
Results: In this study, 118 cases of abortion were included. In tissue culture method, 6 samples (7.2%) had intracellular inclusion body. Of these samples only 4 had cytomegalovirus nucleic acid by PCR method. Two cases showed increasing anti-cytomegalovirus IgM with ELISA but they were negative by tissue culture method. In general, 6 cases (7.2%) of cytomegalovirus infection were diagnosed.
Conclusion: ELISA and tissue culture methods should be performed together. Cytomegalovirus infection has not likely any relation with habitual abortion and is seen in first time abortions preferably.