Emerging viral infections in Australia

Area of Science:

• Zoonotic viral infections
• Neurological diseases
• Infectious disease epidemiology

Background:

• Hendra virus and Australian bat lyssavirus (ABLV) are zoonotic viruses with significant public health implications.
• Both viruses can cause severe, potentially fatal, neurological disease in humans.
• Understanding transmission routes and clinical presentations is crucial for timely diagnosis and management.

Observation:

• Hendra virus infection should be suspected in individuals with acute pneumonia or encephalitis following close association with horses or bats.
• Australian bat lyssavirus infection should be considered in patients presenting with progressive neurological illness after a history of bat exposure.
• Rabies virus, transmitted by bats, necessitates prompt post-exposure prophylaxis.

Findings:

• Clinical presentation of Hendra virus infection can include pneumonia or encephalitis, sometimes after a prolonged incubation period.
• Progressive neurological illness in a patient with a history of bat exposure raises suspicion for Australian bat lyssavirus.
• Prophylaxis with rabies vaccine and immunoglobulin is recommended following potential exposure to bats (e.g., bite, scratch, mucous membrane contact).

Implications:

• Early recognition of Hendra virus and Australian bat lyssavirus based on exposure history and clinical signs is vital for patient survival.
• Prompt administration of rabies post-exposure prophylaxis can prevent rabies development after bat encounters.
• Awareness of Japanese encephalitis vaccine recommendations for travelers to endemic Asian regions is important for preventing this mosquito-borne illness.