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Hendra virus

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(Redirected from Hendra henipavirus) Species of virus
Hendra henipavirus
Colored transmission electron micrograph of a "Hendra henipavirus" virion (ca. 300 nm length)
Colored transmission electron micrograph of a Hendra henipavirus virion (ca. 300 nm length)
Virus classification Edit this classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Negarnaviricota
Class: Monjiviricetes
Order: Mononegavirales
Family: Paramyxoviridae
Genus: Henipavirus
Species: Hendra henipavirus

Hendra virus (Hendra henipavirus) is a zoonotic virus found solely in Australia. First isolated in 1994, the virus has since been connected to numerous outbreaks of disease in domestic horses and seven human cases. Hendra virus belongs to the genus Henipavirus, which also contains the zoonotic Nipah virus. The reservoir species of Hendra virus are four species of bat within the genus Pteropus native to Australia.

Pathology

Flying foxes experimentally infected with the Hendra virus develop a viraemia and shed the virus in their urine, faeces and saliva for approximately one week. There is no other indication of an illness in them. Symptoms of Hendra virus infection of humans may be respiratory, including hemorrhage and edema of the lungs, or in some cases viral meningitis. In horses, infection usually causes one or more of pulmonary oedema, congestion and neurological signs.

Ephrin B2 has been identified as the main receptor for the henipaviruses.

Transmission

Flying foxes have been identified as the reservoir host of Hendra virus. A seroprevalence of 47% is found in the flying foxes, suggesting an endemic infection of the bat population throughout Australia. Horses become infected with Hendra after exposure to bodily fluid from an infected flying fox. This often happens in the form of urine, feces, or masticated fruit covered in the flying fox's saliva when horses graze below roosting sites.

In 2021 a new variant of Hendra virus named "Hendra virus genotype 2" (HeV-g2) was identified in two flying fox species in Australia. It shares 84% sequence homology to other published Hendra virus genomes. This variant has been identified in at least two horses that showed signs of Hendra virus infection.

Prevention, detection and treatment

Three main approaches are currently followed to reduce the risk to humans.

  • Vaccine for horses.
In November 2012, a vaccine became available for horses. The vaccine is to be used in horses only, since, according to CSIRO veterinary pathologist Dr Deborah Middleton, breaking the transmission cycle from flying foxes to horses prevents it from passing to humans, as well as, "a vaccine for people would take many more years."
The vaccine is a subunit vaccine that neutralises Hendra virus and is composed of a soluble version of the G surface antigen on Hendra virus and has been successful in ferret models.
By December 2014, about 300 000 doses had been administered to more than 100 000 horses. About 3 in 1000 had reported incidents; the majority being localised swelling at the injection site. There had been no reported deaths.
In August 2015, the Australian Pesticides and Veterinary Medicines Authority (APVMA) registered the vaccine. In its statement the Australian government agency released all its data on reported side effects. In January 2016, APVMA approved its use in pregnant mares.
  • Stall-side test to assist in diagnosing the disease in horses rapidly.
Although the research on the Hendra virus detection is ongoing, a promising result has found using antibody-conjugated magnetic particles and quantum dots.
  • Post-exposure treatment for humans.
Nipah virus and Hendra virus are closely related paramyxoviruses that emerged from bats during the 1990s to cause deadly outbreaks in humans and domesticated animals. National Institute of Allergy and Infectious Diseases (NIAID)-supported investigators developed vaccines for Nipah and Hendra virus based on the soluble G-glycoproteins of the viruses formulated with adjuvants. Both vaccines have been shown to induce strong neutralizing antibodies in different laboratory animals.
Trials began in 2015 to evaluate a monoclonal antibody to be used as a possible complementary treatment for humans exposed to Hendra virus infected horses.
  • Deforestation Impact.
When considering any zoonosis, one must understand the social, ecological, and biological contributions that may be facilitating this spillover. Hendra virus is believed to be partially seasonally related, and there is a suggested correlation between breeding time and an increase in the incidence of Hendra virus in flying fox bats.
Additionally, recent research suggests that the upsurge in deforestation within Australia may be leading to an increase in the incidence of Hendra virus. Flying fox bats tend to feed in trees during a large part of the year. However, due to the lack of specific fruit trees within the area, these bats are having to relocate and thereby are coming into contact with horses more often. The two most recent outbreaks of Hendra virus in 2011 and 2013 appear to be related to an increased level of nutritional stress among the bats as well as relocation of bat populations. Work is currently being done to increase vaccination among horses as well as replant these important forests as feeding grounds for the flying fox bats. Through these measures, the goal is to decrease the incidences of the highly fatal Hendra virus.

History

Locations of henipavirus outbreaks (red stars–Hendra virus; blue stars–Nipah virus) and distribution of henipavirus flying fox reservoirs (red shading–Hendra virus; blue shading–Nipah virus)

Emergence

Hendra virus (originally called "Equine morbillivirus") was discovered in September 1994 when it caused the deaths of thirteen horses, and a trainer at a training complex at 10 Williams Avenue, Hendra, a suburb of Brisbane in Queensland, Australia.

The index case, a mare called Drama Series, brought in from a paddock in Cannon Hill, was housed with 19 other horses after falling ill, and died two days later. Subsequently, all of the horses became ill, with 13 dying. The remaining six animals were subsequently euthanised as a way of preventing relapsing infection and possible further transmission. The trainer, Victory ('Vic') Rail, and the stable foreman, Ray Unwin, were involved in nursing the index case, and both fell ill with an influenza-like illness within one week of the first horse's death. The stable hand recovered but Rail died of respiratory and kidney failure. The source of the virus was most likely frothy nasal discharge from the index case.

A second outbreak occurred in August 1994 (chronologically preceding the first outbreak) in Mackay 1,000 km north of Brisbane resulting in the deaths of two horses and their owner. The owner assisted in necropsies of the horses, and within three weeks was admitted to hospital suffering from meningitis. He recovered, but 14 months later developed neurologic signs and died. This outbreak was diagnosed retrospectively by the presence of Hendra virus in the brain of the patient.

Outbreak in Australia

Hendra virus is located in QueenslandHendraHendraMackayMackayHendra virusHendra virusTownsvilleTownsvilleHendra virusHendra virusHendra virusHendra virusBowenBowenHendra virusHendra virusHendra virusHendra virusHendra virusHendra virusHervey BayHervey BayHendra virusChinchillaChinchillaHendra virusHendra virusRockhamptonRockhamptonInghamInghamCairnsCairnsHendra virusHendra virusHendra virusHendra virusHendra virusHendra virusclass=notpageimage| Red dots show outbreaks in Queensland Hendra virus is located in New South WalesHendra virusBallina Ballina MacksvilleMacksvilleMullumbimbyMullumbimbyLismoreLismoreKempseyKempseySconeSconeSydneySydneyclass=notpageimage| Red dots show outbreaks in New South Wales

As of June 2014, a total of fifty outbreaks of Hendra virus have occurred in Australia, all involving infection of horses. As a result of these events, eighty-three horses have died or been euthanized. A further four died or were euthanized as a result of possible Hendra infection.

Case fatality rate in humans is 60% and in horses 75%.

Four of these outbreaks have spread to humans as a result of direct contact with infected horses. On 26 July 2011 a dog living on the Mt Alford property was reported to have HeV antibodies, the first time an animal other than a flying fox, horse, or human has tested positive outside an experimental situation.

These events have all been on the east coast of Australia, with the most northern event at Cairns, Queensland and the event furthest south at Kempsey, New South Wales. Until the event at Chinchilla, Queensland in July 2011, all outbreak sites had been within the distribution of at least two of the four mainland flying foxes (fruit bats); Little red flying fox, (Pteropus scapulatus), black flying fox, (Pteropus alecto), grey-headed flying fox, (Pteropus poliocephalus) and spectacled flying fox, (Pteropus conspicillatus). Chinchilla is considered to be only within the range of little red flying fox and is west of the Great Dividing Range. This is the furthest west the infection has ever been identified in horses.

The timing of incidents indicates a seasonal pattern of outbreaks. Initially this was thought to possibly be related to the breeding cycle of the little red flying foxes. These species typically give birth between April and May. Subsequently, however, the Spectacled flying fox and the Black flying fox have been identified as the species more likely to be involved in infection spillovers.

Timing of outbreaks also appears more likely during the cooler months when it is possible the temperature and humidity are more favourable to the longer term survival of the virus in the environment.

There is no evidence of transmission to humans directly from bats, and, as such it appears that human infection only occurs via an intermediate host, a horse. Despite this in 2014 the NSW Government approved the destruction of flying fox colonies.

List of Australian Hendra outbreaks
List of Australian Hendra outbreaks
Date Location Details Deaths (Human) Deaths (Horse)
August 1994 Mackay, Queensland Death of two horses and one person, Mark Preston. 1 2
September 1994 Hendra, Queensland 20 horses died or were euthanised. Two people infected. One of them, Victory ("Vic") Rail, a nationally prominent trainer of racehorses, died. 1 20
January 1999 Trinity Beach, Cairns, Queensland Death of one horse. 1
October 2004 Gordonvale, Cairns, Queensland Death of one horse. A veterinarian involved in autopsy of the horse was infected with Hendra virus, and suffered a mild illness. 0 1
December 2004 Townsville, Queensland Death of one horse. 1
June 2006 Peachester, Sunshine Coast, Queensland Death of one horse. 1
October 2006 Murwillumbah, New South Wales Death of one horse. 1
July 2007 Peachester, Sunshine Coast, Queensland Infection of one horse (euthanised)
July 2007 Clifton Beach, Cairns, Queensland Infection of one horse (euthanised).
July 2008 Redlands, Queensland Death of five horses; four died from the Henda virus, the remaining animal recovered but was euthanised because of a government policy that requires all animals with antibodies to be euthanised due to a potential threat to health. Two veterinary workers from the affected property were infected leading to the death of one, veterinary surgeon Ben Cuneen, on 20 August 2008. The second veterinarian was hospitalized after pricking herself with a needle she had used to euthanize the horse that had recovered. A nurse exposed to the disease while assisting Cuneen in caring for the infected horses was also hospitalized. The Biosecurity Queensland website indicates that 8 horses died during this event, however a review of the event indicates that five horses are confirmed to have died from HeV and three of the horses "are regarded as improbable cases of Hendra virus infection...". 1 4
July 2008 Proserpine, Queensland Death of four horses. 4
July 2009 Cawarral, Queensland Death of four horses. Queensland veterinary surgeon Alister Rodgers tested positive after treating the horses. On 1 September 2009 after two weeks in a coma, he became the fourth person to die from exposure to the virus. 1 4
September 2009 Bowen, Queensland Death of two horses. 2
May 2010 Tewantin, Queensland Death of one horse. 1
20 June 2011 – 31 July 2011 Mount Alford, Queensland Death of three horses (all confirmed to have died of Hendra) and sero-conversion of a dog. The first horse death on this property occurred on 20 June 2011, although it was not until after the second death on 1 July 2011 that samples taken from the first animal were tested. The third horse was euthanised on 4 July 2011. On 26 July 2011 a dog from this property was reported to have tested positive for HeV antibodies. Reports indicate that this Australian Kelpie, a family companion, will be euthanised in line with government policy. Biosecurity Queensland suggest the dog most likely was exposed to HeV though one of the sick horses. Dusty was euthanised on 31 July 2011 following a second positive antibody test. 3
26 June 2011 Kerry, Queensland The horse was moved after it became sick to another property at Beaudesert, Queensland. Death of one horse. 1
28 June 2011 Loganlea, Logan City, Queensland Death of one horse. Unusually this horse had HeV antibodies present in its blood at the time of death. How this immune response should be interpreted is a matter of debate. 1
29 June 2011 Mcleans Ridges, Wollongbar, New South Wales Death of one horse. The second horse on the property tested positive to Hendra and was euthanised on 12 July 2011. 1
3 July 2011 Macksville, New South Wales Death of one horse. 2
4 July 2011 Park Ridge, Logan City, Queensland Death of one horse. 1
11 July 2011 Kuranda, Queensland Death of one horse. 1
13 July 2011 Hervey Bay, Queensland Death of one horse. 1
14 July 2011 Lismore, New South Wales Death of one horse. 1
15 July 2011 Boondall, Queensland Death of one horse. 1
22 July 2011 Chinchilla, Queensland Death of one horse. 1
24 July 2011 Mullumbimby, New South Wales Death of one horse. 1
13 August 2011 Mullumbimby, New South Wales Death of one horse. A horse was found dead after being unwell the day before. HeV infection was confirmed on 17 August 2011. 1
15 August 2011 Ballina, New South Wales Death of one horse. 1
17 August 2011 South Ballina, New South Wales Death of two horses. The horses were found dead in a field. Both tested positive to HeV. The exact date of death is not known, but HeV infection was confirmed on 17 August 2011. 2
23 August 2011 Currumbin Valley, Gold Coast, Queensland Death of one horse. 1
28 August 2011 North of Ballina, New South Wales Death of one horse. 1
11 October 2011 Beachmere, Caboolture Queensland One horse euthanised after testing positive. A horse that died on the property one week before may have died of HeV. On 15 October 2011 another horse on the property was euthanised following a positive HeV antibody test. 1
3 January 2012 Townsville, Queensland A horse that died or was euthanised on 3 January 2012 returned a positive HeV test on 5 January 2012. 1
26 May 2012 Rockhampton, Queensland One horse died. 1
28 May 2012 Ingham, Queensland One horse died. A dog returned a positive test but was subsequently cleared. 1
19 July 2012 Rockhampton, Queensland One horse died. On 27 July it was announced that two other horses on the property, showing clinical signs of the disease, had been euthanised. Two dogs were assessed, and the property was quarantined. 1
27 June 2012 Mackay, Queensland One horse was euthanised after returning a positive HeV test. 15 horses on the property are being tested and quarantined, along with horses on neighbouring properties. 1
27 July 2012 Cairns, Queensland One horse died. 1
5 September 2012 Port Douglas, Queensland One horse died. The property with 13 other horses is quarantined. 1
1 November 2012 Ingham, Queensland One symptomatic horse euthanised. A test for HeV the following day proved positive. The property, with seven other horses, quarantined. 1
20 January 2013 Mackay, Queensland One horse died. 1
19 February 2013 Atherton Tablelands, North Queensland One horse died. Four horses and four people from the property were assessed. 1
3 June 2013 Macksville, New South Wales Death of one horse, a second horse vaccinated, five cats and a dog were monitored. 1
1 July 2013 Tarampa, Queensland One horse died. HeV virus confirmed. 1
4 July 2013 Macksville, New South Wales Six year old gelding died. Several other horses, dogs and cats were tested. A dog from the property tested positive for HeV and was euthanised around 19 July 2013 1
5 July 2013 Gold Coast, Queensland One horse died. No other horses on property. 1
6 July 2013 Kempsey, New South Wales Eighteen-year-old unvaccinated mare died, other animals on property under observation. 1
9 July 2013 Kempsey, New South Wales Thirteen-year-old unvaccinated quarterhorse died, other animals on property were put under observation. 1
18 March 2014 Bundaberg, Queensland Unvaccinated horse euthanized. Tested positive for Hendra and was euthanized 1
1 June 2014 Beenleigh, Queensland Horse euthanised and property quarantined after outbreak at a property.
20 Jun 2014 Murwillumbah, New South Wales A 31 year old stock horse died in the early hours of 20 June. 1
20 July 2014 Calliope, Queensland Horse euthanised and property quarantined after outbreak. 1
20 Jun 2015 Murwillumbah, New South Wales Horse found dead after several days of illness. HeV confirmed as the cause of death. 1
About 20 July 2015 Atherton Tableland, Queensland Infected horse died and property quarantined. 1
About 4 September 2015 Lismore, New South Wales Infected horse euthanised and property quarantined. 1
About 15 December 2016 Casino, New South Wales Horse died around 15 December 2016 after being ill for several weeks. 1
About 24 May 2017 Gold Coast, Queensland An unvaccinated infected horse euthanised and property quarantined.
About 8 July 2017 Lismore, New South Wales Hendra virus confirmed near Lismore after symptomatic horse tested positive for Hendra.
About 1 August 2017 Murwillumbah, New South Wales Hendra virus confirmed near Murwillumbah after symptomatic horse tested positive for the virus. NSW Department of Primary Industries identified this as the second Hendra case in NSW for the year 2017.
About 5 August 2017 Lismore, New South Wales Hendra case confirmed near Lismore results in euthanasia of symptomatic Welsh Pony. Property was placed under inspection. Third confirmed case in NSW in the span of four weeks.
7 June 2019 Scone, New South Wales An unvaccinated mare contracted Hendra and had to be euthanized. Quarantine protocols and assessments were completed on the property. Represents the Southernmost documented case of Hendra in horses. 1
3 June 2020 Murwillumbah, New South Wales An unvaccinated horse contracted Hendra and had to be euthanized. Represents the first documented case of 2020. 1
18 July

2023

Newcastle, New South Wales An unvaccinated horse died from a case of symptomatic Hendra. Property was accessed for risks and no transmitted cases were identified. 1

Events of June–August 2011

This section needs to be updated. Please help update this article to reflect recent events or newly available information. (July 2020)

In the years 1994–2010, fourteen events were recorded. Between 20 June 2011 and 28 August 2011, a further seventeen events were identified, during which twenty-one horses died.

It is not clear why there was a sudden increase in the number of spillover events between June and August 2011. Typically HeV spillover events are more common between May and October. This time is sometimes called "Hendra Season", which is a time when there are large numbers of fruit bats of all species congregated in SE Queensland's valuable winter foraging habitat. The weather (warm and humid) is favourable to the survival of henipavirus in the environment.

It is possible flooding in SE Queensland and Northern NSW in December 2010 and January 2011 may have affected the health of the fruit bats. Urine sampling in flying fox camps indicate that a larger proportion of flying foxes than usual are shedding live virus. Biosecurity Queensland's ongoing surveillance usually shows 7% of the animals are shedding live virus. In June and July nearly 30% animals have been reported to be shedding live virus. Present advice is that these events are not being driven by any mutation in HeV itself.

Other suggestions include that an increase in testing has led to an increase in detection. As the actual mode of transmission between bats and horses has not been determined, it is not clear what, if any, factors can increase the chance of infection in horses.

Following the confirmation of a dog with HeV antibodies, on 27 July 2011, the Queensland and NSW governments will boost research funding into the Hendra virus by $6 million to be spent by 2014–2015. This money will be used for research into ecological drivers of infection in the bats and the mechanism of virus transmission between bats and other species. A further 6 million dollars was allocated by the federal government with the funds being split, half for human health investigations and half for animal health and biodiversity research.

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