Toxocara DNA amplification in serum and tissue samples in BALB/c mice.

Toxocariasis is still a neglected parasitic disease worldwide and much about its biology and diagnosis has yet to be understood. The migration of third stage larvae via bloodstream suggests a potential use of molecular tools in diagnosis as well to deepen the knowledge about its migration behaviors. Conventional PCR was applied in serum and tissue samples from BALB/c mice infected with 5 and 500 embryonated eggs. Blood samples were collected at 15, 30, 60, 90 and 120 days post-infection. Organs were excised at 170 days post infection. There was no DNA amplification in serum samples in any group or day post-infection; contrarily, tissue samples showed DNA amplification. These results also support a continuous larval migration after and/or simultaneously with the neurotropic-myotropic phase. Thus, molecular tools might be useful as a differential diagnosis method, but do not replace immunodiagnostics techniques.

Coping strategies of family members of intensive care unit patients.

OBJECTIVE: To analyse the coping strategies of family members of patients admitted to intensive care units. DESIGN: A cross-sectional study developed with 70 relatives of patients admitted to the intensive care unit. SETTING: An adult intensive care unit at a university hospital in Brazil. MAIN OUTCOME MEASURES: Coping strategies were identified by the Folkman and Lazarus Inventory of Coping Strategies and statistically compared to the sociodemographic data of family members and patients' clinical data. RESULTS: Coping strategies focused on emotion were the most used, especially those attributed to the escape-avoidance factor. There was a significant association (p < 0.05) between women and the use of adaptive strategies focused on the problem; less education and lower income with maladaptive strategies focused on emotion; second-degree relatives and the positive reassessment factor; participants involved in religious activities and the social support factor. Regarding the clinical variables, patients admitted to the intensive care unit for more than seven days showed an association (p < 0.05) with the social support factor. CONCLUSION: Family members used adaptive coping strategies more focused on emotion. Additionally, the lower the educational and economic levels, the greater the use of maladaptive strategies focused on emotion.

[Immunodiagnosis of Strongyloides stercoralis infections in Chile using ELISA test]. / Inmunodiagnóstico de las infecciones por Strongloides stercoralis en Chile utilizando la prueba de ELISA.

BACKGROUND: Strongyloides stercoralis is a world wide distributed small intestinal nematode parasite. In immunocompetent individuals S stercoralis can produce asymptomatic infections or a moderate clinical picture of diarrhea, some cases become chronic. In immunocompromised patients, a disseminated disease may appear, sometimes fatal. In Chile, there is little epidemiological information about S stercoralis infections and appropriate diagnostic techniques are usually not used. AIM: To evaluate the yield of an ELISA test for the diagnosis of strongyloidiasis in Chilean patients. MATERIAL AND METHODS: Ten serum samples from patients with S stercoralis infections confirmed by a positive stool examination, 66 samples from individuals with other infections by tissue helminthes (24 toxocariasis, 15 trichinellosis, 11 hydatidosis, 12 fascioliasis and 4 cysticercosis), 13 samples from subjects with autoimmune diseases and 49 samples from apparently healthy individuals with a normal eosinophil count, were studied. ELISA antigen was prepared using a filariform larval extract obtained from a murine species of Strongyloides, maintained in laboratory animals. RESULTS: Using 0.33 optical density units as a cut off value, 9 of 10 sera of S stercoralis infected individuals, had a positive ELISA test. No cross reactions were observed with sera of patients with other helminthic infections, autoimmune diseases or in healthy individuals. Thus, specificity, positive and negative predictive values were 100%. CONCLUSIONS: The results obtained are similar with those found by other investigators. ELISA test for strongyloidiasis is a useful tool for the diagnosis of clinical cases and for seroepidemiological studies of this nematode infection in Chile.