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- Title
Spontaneous abortion among Toxoplasma gondii IgG seropositive women: Molecular detection, genotype identification, and serological assessment with conventional ELISA and avidity ELISA.
- Authors
Khademi, Seyedeh Zahra; Ghaffarifar, Fatemeh; Dalimi, Abdolhossein; Davoodian, Parivash; Abdoli, Amir
- Abstract
Objectives: It has been generally believed that women who exposed to Toxoplasma gondii before pregnancy and have anti‐T. gondii IgG antibody are immunized and their newborns will be protected from congenital infection. This study is aimed to investigate the role of T. gondii infection in spontaneous abortion through serological and molecular methods in southern Iran. Study design: Blood samples were taken from 50 spontaneously aborted mothers and anti‐T. gondii antibodies were assessed using conventional enzyme‐linked immunosorbent assay (ELISA) and avidity ELISA methods. The placenta and blood samples of aborted women were used for detection of the parasite's DNA by polymerase chain reaction (PCR) method targeting the RE gene. The parasite genotypes were determined by PCR‐restriction fragment length polymorphism (RFLP) method using SAG3 and GRA6 genes. Results: IgG antibody was detected in 28% (14/50) of mothers, but all samples were negative for IgM antibody. In the avidity ELISA test, 26% (13/50) of the samples had a high avidity index, suggesting chronic infection, while a low avidity index was detected in one case (2%), which suggests acute infection. The parasite's DNA was detected in 18% (9/50) and 14% (7/50) of blood and placenta samples, respectively. All DNA positive samples were IgG positive. All isolates were belonged to the T. gondii type III genotype. Conclusion: The results suggest that T. gondii seropositive women are not protected from congenital transmission. However, the results should be interpreted cautiously until further studies will be confirmed these results.
- Subjects
IRAN; DNA analysis; RISK factors in miscarriages; IMMUNOGLOBULIN analysis; PROTOZOA; ANTIGEN-antibody reactions; COMMUNICABLE diseases; MICROBIAL genetics; SERODIAGNOSIS; CHRONIC diseases; TOXOPLASMOSIS; BLOOD collection; GENETIC polymorphisms; RISK assessment; MOLECULAR biology; INFECTION; PREGNANCY complications; GENOTYPES; ENZYME-linked immunosorbent assay; PLACENTA; DESCRIPTIVE statistics; POLYMERASE chain reaction; VERTICAL transmission (Communicable diseases); INFECTIOUS disease transmission; DISEASE complications; PREGNANCY
- Publication
Journal of Obstetrics & Gynaecology Research, 2022, Vol 48, Issue 10, p2479
- ISSN
1341-8076
- Publication type
Article
- DOI
10.1111/jog.15349