RESUMEN
OBJECTIVE: It is known that varicella-zoster virus (VZV) can cause asymptomatic infections, but it has not been described that congenital infection can be caused by maternal subclinical infection. The purpose of this study is to evaluate clinical and neuropathologic findings of infants with neonatal seizures and cerebrospinal fluid (CSF) VZV antibodies, but no maternal clinical VZV infection during the pregnancy. STUDY DESIGN: Screening of 201 neonates were studied for congenital viral infections, because of neurologic problems of unknown origin. Antibodies to 16 different microbes were investigated from the CSF and the serum of the neonates, as well as from the first trimester and postpartum serum of their mothers. Clinical symptoms and signs as well as neuropathology of those infants with antibodies to VZV in CSF were evaluated in this study. RESULTS: Four neonates with antibodies to VZV in CSF were identified and CSF findings were reported earlier. Their mothers had laboratory evidence of infection, based on a significant rise in serum VZV antibody level during pregnancy in three mothers, and a constantly high antibody level to VZV in one mother. All four children had seizures and abnormalities in muscular tone during the neonatal period, but no typical manifestations of a congenital VZV infection. One child died at the age of 4 months. At autopsy, neuropathologic examination showed foci of astrocytic hyperplasia and hypertrophy but no specific signs of viral infection. CONCLUSION: Maternal subclinical VZV infection can cause congenital infection with neurologic symptoms and signs in the child.
Asunto(s)
Herpes Zóster/congénito , Herpesvirus Humano 3/inmunología , Complicaciones Infecciosas del Embarazo/virología , Anticuerpos Antivirales/líquido cefalorraquídeo , Electroencefalografía , Femenino , Herpes Zóster/diagnóstico , Humanos , Recién Nacido , Masculino , Enfermedades Musculares/virología , Examen Neurológico , Embarazo , Convulsiones/virologíaRESUMEN
Liposomes are small membrane-enclosed vesicles composed of either natural or synthetic lipids. Their size can be adjusted on a wide scale and they can be made with well-defined compositions. While liposomes have been extensively used as model biomembranes they have also gained a considerable degree of attention as carriers for drugs as well as for genetic material. The physical properties of liposomes are critically dependent on their chemical composition. In this study liposomes were applied as pseudostationary phases in electrokinetic capillary chromatography. Various negatively charged liposomes, consisting of mixtures of zwitterionic and anionic lipids, were investigated. Major emphasis was put on clarifying the effects of the total lipid concentration, the lipid molar ratio, the lipid head group, and the buffer on the capillary electrophoretic separation of neutral analytes. In addition, the influence of the physical state of the membrane, ie., gel vs. fluid, on the separation was investigated. Corticosteroids were applied as model analytes.
Asunto(s)
Corticoesteroides/análisis , Electroforesis Capilar/métodos , Liposomas , Fosfolípidos , Corticoesteroides/aislamiento & purificación , Portadores de Fármacos , Cinética , Relación Estructura-ActividadRESUMEN
BACKGROUND: To re-evaluate the impact of socioeconomic status and human cytomegalovirus (HCMV) seroprevalence during pregnancy, we carried out a population-based cohort study. METHODS: IgG and IgM antibodies to HCMV and IgG avidity were studied by enzyme-linked immunosorbent assay (ELISA) in three different socioeconomic areas (SEA) in the 9-12th week of pregnancy of 1088 consecutive mothers. RESULTS: The overall IgG seropositivity was 70.7%, ranging from 60.9 to 76.4% in 'upper' to 'lower' SEA (P = 0.0004). The HCMV IgM seropositivity was 4.0%, ranging from 3.8% in the 'upper' and 'intermediate' SEA to 4.6% in the 'lower' SEA. Serologically acute cases, defined by low avidity of IgG, represented 1.7% of the pregnancies in the 'upper' SEA compared with 1.0 and 1.1% in the other two areas. In the 'lower' SEA there were twice as many recurrent infections as in the others, 3.6 versus 1.7%. The low impact of age did not increase after elimination of the effects of SEA and parity. Miscarriages were associated neither with IgG nor with IgM positivity, although the percentage of >/=2 miscarriages was 8.8% in seronegative women compared with 11.2% and 13.6% in IgG- and IgM-positive women. CONCLUSIONS: Social environment seems to be the most powerful factor, predicting both IgG seroprevalence and recurrences during pregnancy.
Asunto(s)
Infecciones por Citomegalovirus/epidemiología , Citomegalovirus/inmunología , Complicaciones Infecciosas del Embarazo/virología , Clase Social , Adolescente , Adulto , Estudios de Cohortes , Femenino , Humanos , Inmunoglobulina G/análisis , Inmunoglobulina M/análisis , Embarazo , Complicaciones Infecciosas del Embarazo/epidemiología , Primer Trimestre del Embarazo , Recurrencia , Factores de Riesgo , Estudios SeroepidemiológicosRESUMEN
Four neonates with convulsions had IgG antibodies in their cerebrospinal fluid (CSF) to varicella zoster virus (VZV). These antibodies were found in the sera of two of these patients after the age of 6 months. Antibodies to 16 different microbes were studied from the serum and CSF of 201 neonates with neurological problems. The presence of DNA specific to HSV-1, HSV-2, and VZV in the CSF was also investigated using the polymerase chain reaction (PCR). Antibodies to VZV were detected in the CSF of four neonates. Antibody indices suggested production of VZV specific antibodies in the central nervous system. These findings suggest that intrathecal production of antibodies to VZV can appear in neonates with neurological problems, which suggests that intrauterine VZV infection can be acquired without cutaneous symptoms in the mother.