RESUMO
BACKGROUND: Parvovirus B19(B19) is a DNA virus. The most common B19 disease is erythema infectiosum (fifth-disease). PCR and ELISA are sensitive for detecting of acute disease. However, it is not clear which test better and the relationship between laboratory tests and clinical findings. OBJECTIVE: To discuss the clinical and laboratory characteristics of pediatric patients infected with B19. STUDY DESIGN: 236 children were examined. Children with at least one positive molecular or serological test were included. Positive serum B19-DNA and/or B19-IgM was considered an acute B19 infection. RESULTS: B19DNA was detected in 80.8 % of acute cases. Serological tests were less positive. Acute B19 infection was observed in 24 patients. Only 17 patients were positive for B19 DNA, 3 for IgM and 4 for both. The sensitivity of B19 DNA is 87.5 %. However, this rate is 29.2 % for B19 IgM. CONCLUSION: B19-DNA and IgM together provide a better, highly accurate diagnosis.
Assuntos
Anticorpos Antivirais , DNA Viral , Eritema Infeccioso , Imunoglobulina M , Parvovirus B19 Humano , Humanos , Parvovirus B19 Humano/genética , Parvovirus B19 Humano/imunologia , Parvovirus B19 Humano/isolamento & purificação , Criança , Imunoglobulina M/sangue , Pré-Escolar , Feminino , Masculino , DNA Viral/sangue , Anticorpos Antivirais/sangue , Eritema Infeccioso/diagnóstico , Eritema Infeccioso/sangue , Eritema Infeccioso/imunologia , Lactente , Sensibilidade e Especificidade , Adolescente , Reação em Cadeia da Polimerase/métodos , Infecções por Parvoviridae/diagnóstico , Infecções por Parvoviridae/sangue , Infecções por Parvoviridae/imunologia , Infecções por Parvoviridae/virologia , Ensaio de Imunoadsorção Enzimática , Testes Sorológicos/métodosRESUMO
Cytomegalovirus (CMV) can cause serious complications in immunocompromised individuals and fetuses with congenital infections. These can include neurodevelopmental impairments and congenital abnormalities in newborns. This paper emphasizes the importance of concurrently evaluating ultrasonography findings and laboratory parameters in diagnosing congenital CMV infection. To examine the prenatal characteristics of CMV DNA-positive patients, we assessed serum and amniotic fluid from 141 pregnant women aged 19-45 years, each with fetal anomalies. ELISA and PCR tests, conducted in response to these amniocentesis findings, were performed at an average gestational age of 25 weeks. Serological tests revealed that all 141 women were CMV IgG-positive, and 2 (1.41%) had low-avidity CMV IgG, suggesting a recent infection. CMV DNA was detected in 17 (12.05%) amniotic fluid samples using quantitative PCR. Of these, 82% exhibited central nervous system abnormalities. Given that most infections in pregnant women are undetectable and indicators non-specific, diagnosing primary CMV in pregnant women using clinical findings alone is challenging. We contend that serological tests should not be the sole means of diagnosing congenital CMV infection during pregnancy.