Toxocariasis, a zoonotic infection transmitted by Toxocara canis (from dogs) and Toxocara cati (from cats) larvae, poses rare but severe risks to humans. We present a case of hepatic visceral larva migrans (VLM) caused by Toxocara canis in a 21-year-old male with a history of close contact with a pet dog. Initial symptoms and imaging findings mimicked a pyogenic liver abscess. The initial laboratory investigations revealed neutrophilia and elevated levels of IgE. Despite broad-spectrum antibiotics, persistent fever prompted further investigation. Subsequent serological testing for Toxocara antibodies and histopathological analysis of liver tissue demonstrating eosinophil infiltrates and Charcot-Leyden crystals led to a confirmed diagnosis of a liver abscess caused by Toxocara canis. Serological testing for Toxocara antibodies and histopathological analysis of liver tissue confirmed a Toxocara canis-induced liver abscess. Albendazole treatment yielded significant clinical improvement. This case highlights the necessity of considering toxocariasis in liver abscess differentials, particularly in high-seroprevalence regions like Vietnam. Relying solely on serological tests may be insufficient, emphasizing the need for corroborative evidence, including invasive procedures like liver biopsy, for accurate hepatic toxocariasis diagnosis.

Background: In recent year, provinces in coastal south west area have many changes in environment which makes difficult to manage the epidemiology of malaria. Objective: To investigate ecological character of An.epiroticus in newly salinized areas of Can Duoc distrist, Long An province. Subject and Method:The investigation of An.epiroticus and environmental factors was carried out in newly salinized areas in Can Duoc district, Long An province from 2006- 2007. Result and Conclusion: The result showed that An.epiroticus populations in both zones categorized as shrimp-rice fields and brackish shrimp fields were anthropophilic. This species bites human both in and outdoor throughout the night with peak of biting rates were from 20h00 to 02h00. A considerable number of An.epiroticus was found to rest indoors in the morning. This species in studied site was resistant to both Alpha-cypermethrin and Lambdacyhalothrin. The larvae of An.epiroticus were mainly found in stagmant or slow running brakish water bodies having salinity of 1.0 to 3.5 g of NaCl/litre; pH = 7.0 - 8.0; temperature 28 - 30\xb0C; with presence of aquatic plants.
Ecological character ; An.epiroticus