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In Vivo Imaging Systems (IVIS) Detection of a Neuro-Invasive Encephalitic Virus

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Published on: December 2, 2012

Nipah virus encephalitis outbreak in Malaysia.

Sai Kit Lam¹, Kaw Bing Chua

¹Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia. lamsk@ummc.edu.my

Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America

|April 9, 2002

Summary

Emerging infectious diseases like Nipah virus pose global health risks. Controlling outbreaks, such as the Malaysian pig-associated Nipah virus encephalitis, involves animal culling and understanding zoonotic transmission.

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Area of Science:

Veterinary Medicine
Infectious Diseases
Virology

Background:

Emerging infectious diseases, particularly zoonotic ones, present significant global health challenges.
The 1998 Malaysian outbreak of severe febrile encephalitis, caused by the Nipah virus, exemplifies this threat.
Nipah virus poses risks of international spread via infected animals and substantial economic losses.

Purpose of the Study:

To detail the clinical and pathological features of Nipah virus infection.
To identify the likely reservoir and transmission dynamics of the Nipah virus.
To document the control measures implemented during the Malaysian outbreak.

Main Methods:

Clinical case analysis of affected pig farmers.
Histopathological examination of affected organs, including the brain.
Magnetic resonance imaging (MRI) to assess neurological lesions.
In vitro studies on Nipah virus in Vero cells.
Serological and ecological investigations to identify the virus reservoir.

Main Results:

Clinical presentation included fever, encephalitis, segmental myoclonus, areflexia, hypertension, and tachycardia.
Histopathology revealed endothelial damage and vasculitis in the brain and other organs.
MRI showed disseminated high-signal-intensity lesions in the brain.
Nipah virus induced syncytial formation in Vero cells and showed antigenic relation to Hendra virus.
The Island flying fox (Pteropus hypomelanus) was identified as the likely reservoir.

Conclusions:

Nipah virus is an emergent paramyxovirus with significant zoonotic potential and severe clinical manifestations.
Effective control of the Malaysian outbreak involved the culling of over one million pigs.
Understanding the ecology and transmission of Nipah virus is crucial for preventing future outbreaks.