Psittacosis in humans in Argentina (1977-1981)

Ha sido estudiada en Argentina la incidencia de Chlamydia psittaci durante el período 1977-1981 empleando la técnica de fijación de complemento en 949 muestras de sueros obtenidas de pacientes con datos epidemiológicos y/o clínicos compatibles con ornitosis. Del total, 387 (41%) presentaron anticuerpos contra antígeno de Chlamydia psittaci. La incidencia fue mayor en adultos que en niños y en hombres que en mujeres. Hubo mayor incidencia en primavera que en las restantes estaciones. En el 25% de los casos positivos no se pudo establecer el antecedentes de contacto con aves. Hubo 2 casos de contagio inter-humano. Con posterioridad al brote epidémico de 1977 se observa entre 1978 y 1981 un incremento anual del número de casos diagnosticados. Resta dilucidar si esto es debido a un aumento real de la enfermedad o a un mejor conocimiento de la misma

Nuevas observaciones de la infección de roedores por el virus Junin dentro y fuera de la zona endemica de la Fiebre Hemorragica Argentina / [New findings on Junin virus infection in rodents inside and outside the endemic area of hemorrhagic fever in Argentina]

In conjunction with field trials for a vaccine against Argentine Hemorrhagic Fever (AHF), small mammals were trapped during a 28-month period (1 November 1987 to 13 March 1990) in 3 epidemiologically defined areas of the central Argentine pampas: northern and central Buenos Aires provinces were included in the AHF [quot ]historic[quot ] area, where the disease was common 15-20 years ago, but case rates are currently low; southern Santa Fe province is the current high-incidence area for AHF; the nonendemic area was represented by two localities 60-90 km beyond the northernmost extension of human disease. Animals were live-trapped for 3 days per month in permanent [quot ]mark-recapture[quot ] grids in each of the 3 areas. Samples of blood, sera, and oral swabs were taken from these animals before they were marked and released at the site of capture. In addition, [quot ]removal[quot ] traplines provided animals from 16 localities in these 3 areas which were sacrificed to obtain samples of organs in addition to the aforementioned samples. Samples were tested for the presence of Junin virus (JV) antigen by enzyme immunoassay (ELISA). In this assay, a pool of 13 mouse anti-JV glycoprotein and nucleocapsid monoclonal antibodies adsorbed to the surface of microtiter plates was used to capture JV antigen in sample suspensions. A polyclonal rabbit anti-JV antiserum was added as a detector antibody, and an anti-rabbit antibody conjugated to horseradish peroxidase applied with substrate to complete the sandwich.(ABSTRACT TRUNCATED AT 250 WORDS)