Strongyloid Hyperinfection in a Patient with Immunocompromised Chronic Kidney Disease.

Strongyloid hyperinfection is seen in immunocompromised individuals with underlying lung disease. The use of immunosuppressive drugs is an important risk factor. We report a case of IgA nephropathy with crescent, started on glucocorticoid and mycophenolate mofetil. He presented with bilateral lung opacities with breathlessness. As the breathlessness was not improving, despite adequate ultrafiltration, bronchoscopy was done. Bronchoalveolar lavage fluid examination showed the presence of strongyloid larvae, which was later demonstrated in stool also. He responded to antihelminthic treatment with disappearance of larvae from stool but later developed secondary bacterial infections.

Infección pulmonar por Strongyloides stercoralis en la provincia de Manabí, Ecuador / Lung infection by Strongyloides stercoralis in the province of Manabí, Ecuador

Strongyloides stercoralis es un nematodo común causante de parasitosis intestinal en la población ecuatoriana, pero no se han documentado casos de infección pulmonar por este helminto en el Ecuador. El primer caso de estrongiloidiasis pulmonar causada por larvas filariformes de S. stercoralis en un paciente de sexo masculino de la provincia de Manabí (Ecuador) y con síntomas clínicos de síndrome pulmonar terminal es reportado en este estudio. Previo al deceso del paciente, las larvas fueron identificadas por el método de frotis directo en fresco de una muestra de aspirado bronquial obtenida del paciente. En el análisis microscópico se observó hiperinfección por larvas filariformes (L3) con una abundancia de hasta cuatro larvas por campo microscópico.Sugerimos que un tratamiento anticipado del paciente con un antihelmíntico de amplio espectro podría haberle salvado la vida. La estrongiloidiasis pulmonar puede ser infradiagnosticada, si no se lleva a cabo el análisis parasitológico de muestras húmedas de aspiración bronquial de pacientes mostrando síntomas de bronquitis crónica y síndrome pulmonar para investigar la posible presencia de S. stercoralis. El entrenamiento para diagnóstico microbiológico por métodos directos clásicos, así como la constante investigación de esta parasitosis y otras helmintiasis son aún vitales y relevantes para el personal técnico de salud pública y microbiólogos en países en vías de desarrollo, con el fin de proveer un tratamiento temprano de las parasitosis infradiagnosticadas.

Strongyloides stercoralis is a common nematode causing intestinal parasitosis in the Ecuadorian population, but cases of lung infection by this helminth have not been documented in Ecuador. We document the first case of pulmonary strongyloidiasis caused by S. stercoralis filariform larvae in a male patient from Manabí Province (Ecuador), showing clinical symptoms of terminal pulmonary syndrome. Previous to the decease of the patient, the larvae were identified by the direct smear method of a fresh bronchial aspirate sample collected from the patient. Hyperinfection by filariform larvae (L3) was observed, exhibiting an abundance of up to four larvae per microscopic field. We suggest that an earlier treatment of the patient with a high spectrum anthelmintic could have saved his life. Strongiloidiasis pulmonar can be underdiagnosed, if the parasitological analysis of wet mounts of bronchial aspirate from patients suffering of chronic bronchitis and pulmonary syndrome to investigate the possible presence of S. stercoralis is not conducted. The training for microbiological screening using classic direct methods, as well as the constant investigation of this parasitosis and other helminthiasis are still vital and relevant for public health personnel and microbiologists in developing countries in order to provide an early diagnosis of underdiagnosed parasitosis.

Pulmonary strongyloidiasis: assessment between manifestation and radiological findings in 16 severe strongyloidiasis cases.

BACKGROUND: Strongyloidiasis is a chronic parasitic infection caused by Strongyloides stercoralis. Severe cases such as, hyperinfection syndrome (HS) and disseminated strongyloidiasis (DS), can involve pulmonary manifestations. These manifestations frequently aid the diagnosis of strongyloidiasis. Here, we present the pulmonary manifestations and radiological findings of severe strongyloidiasis. METHODS: From January 2004 to December 2014, all patients diagnosed with severe strongyloidiasis at the University of the Ryukyus Hospital or affiliated hospitals in Okinawa, Japan, were included in this retrospective study. All diagnoses were confirmed by the microscopic or histopathological identification of larvae. Severe strongyloidiasis was defined by the presence of any of the following: 1) the identification of S. stercoralis from extra gastrointestinal specimens, 2) sepsis, 3) meningitis, 4) acute respiratory failure, or 5) respiratory tract hemorrhage. Patients were assigned to either HS or DS. Medical records were further reviewed to extract related clinical features and radiological findings. RESULTS: Sixteen severe strongyloidiasis cases were included. Of those, fifteen cases had pulmonary manifestations, eight had acute respiratory distress syndrome (ARDS) (53%), seven had enteric bacterial pneumonia (46%) and five had pulmonary hemorrhage (33%). Acute respiratory failure was a common indicator for pulmonary manifestation (87%). Chest X-ray findings frequently showed diffuse shadows (71%). Additionally, ileum gas was detected for ten of the sixteen cases in the upper abdomen during assessment with chest X-ray. While, chest CT findings frequently showed ground-glass opacity (GGO) in 89% of patients. Interlobular septal thickening was also frequently shown (67%), always accompanying GGO in upper lobes. CONCLUSIONS: In summary, our study described HS/DS cases with pulmonary manifestations including, ARDS, bacterial pneumonia and pulmonary hemorrhage. Chest X-ray findings in HS/DS cases frequently showed diffuse shadows, and the combination of GGO and interlobular septal thickening in chest CT was common in HS/DS, regardless of accompanying pulmonary manifestations. This CT finding suggests alveolar hemorrhage could be used as a potential marker indicating the transition from latent to symptomatic state. Respiratory specimens are especially useful for detecting larvae in cases of HS/DS.