Hendra virus ecology and transmission.

This research paper focuses on the ecology and transmission of the Hendra virus, a highly fatal virus that primarily affects horses and humans, with flying-foxes as its natural host. The authors of the study examine several aspects of the virus including its primary mode of transmission, affected species, and prevalence in flying-fox populations.

Hendra Virus and its Natural Host

• The Hendra virus causes acute and deadly infections in horses and humans.
• The natural host of this virus is the pteropid bat, also known as the flying-fox.
• The risk factors for infection in these bats include their age and species.

Transmission of the Virus

• The primary route of excretion for the Hendra virus in flying-foxes is urine. Research has found more frequent detection of the viral RNA in Pteropus alecto and P. conspicillatus species compared to other species.
• While vertical transmission (parent to offspring) and recurrent infection have been reported in flying-foxes, horizontal transmission (infection via another individual or an environmental source) is identified as the major mode of transmission.

Transmission from Flying-Foxes to Horses and Humans

• The most likely route of transmission from flying-foxes to horses is through equine contact with infected flying-fox urine, either directly or through urine-contaminated food or surfaces.
• Horse to horse transmission is relatively inefficient and typically requires direct contact with infected bodily fluids.
• There is no record of direct flying-fox to human transmission; all reported human cases have resulted from close and direct contact with infected horses.

Importance of Understanding Hendra Virus Ecology and Transmission

• Although an effective vaccine for horses has recently become available, a comprehensive understanding of Hendra virus ecology and transmission remains crucial to prevent the inter-species spread of this disease.

Other Observations

• Canine cases of Hendra virus infection have been reported, though they were subclinical (did not display noticeable symptoms) and were found only on properties where equine cases were present.
• The prevalence of infection in flying-foxes can vary from year to year; in some regions, there is a winter peak of excretion.