Conservation

BIRDLIFE SOUTH AFRICA STATEMENT ON AVIAN INFLUENZA

Posted on the 20th October 2017

Update on Avian Influenza in South Africa 

This statement is released by BirdLife South Africa in response to the recent outbreak of avian influenza (H5N8 strain) in South Africa in 2017. At the time of the statement, at least six provinces have been affected, namely the Western Cape, Mpumalanga, Eastern Cape, North West, KwaZulu-Natal and Gauteng. More than 581 carcasses of wild birds have been found in the Gauteng area, including at the Johannesburg Zoo‚ Westdene Dam‚ Emmarentia Dam, Zoo Lake and Montecasino Bird Gardens. Since June 2017, more than 2 million domestic birds/poultry have died or had to be culled in the Western Cape due to the H5N8 outbreak. 

The aim of this statement is to inform all stakeholders about the potential interaction between wild birds and the H5N8 virus and to ensure the protection of wild birds. The spread of avian influenza viruses has resulted in mortality and conservation issues for wild birds, globally. BirdLife South Africa states that: 

• Many influenza viruses are not highly pathogenic and do not readily cause mass mortalities in wild and domestic birds. 

• The highly pathogenic avian influenza outbreaks are usually associated with intensive domestic poultry production. 

• H5N1 is the most important of the highly pathogenic avian influenza viruses, but the local outbreak is caused by the H5N8 strain.

• Although H5N1 has resulted in human infections, H5N8 remains a bird-specific virus. To date, no human infections with H5N8 have been reported. However, appropriate personal hygiene measures should be taken. 

• The specific role of wild birds in the long-distance transmission of the H5N8 virus remains unclear. 

• During the current outbreak In South Africa, we do not have an extensive list of the wild bird species affected, nor do we know the exact species involved in carrying the virus. The main groups affected by H5N8 in South Africa are the Anseriformes (ducks and geese), Galliformes (poultry) and Charadriiformes (gulls, terns and shorebirds). Domesticated ostrich have also been affected. 

• The origin of the H5N8 strain remains unresolved. Phylogenetic analyses indicate that wild birds acquired H5N8 from a pool of H5 viruses in domestic ducks and geese (Anseriformes) in eastern Asia. 

• In 2016, outbreaks from H5N8 were first reported from wild birds in the Republic of Korea, followed by detections of the virus in late spring in the Tyva Republic of the Russian Federation and in India, two countries in the Middle East, two in North Africa and 13 countries in Europe. 

• The virus does not survive for a long period outside the body but can survive for longer periods where water habitats are involved. The virus seems to be more prevalent in waterbirds, e.g. Sacred Ibis, Egyptian Geese and Yellow-billed Duck. 

• Primary transmission is from one bird to the other and this can happen more easily in congregatory species and/or at roost sites. 

• Any bird species could potentially contract the disease and bird breeders need also to be vigilant. 

• Rare and threatened waterbirds might be at highest risk, e.g. White-winged Flufftail where the sequencing of Toll-like receptor genes confirmed a low genetic diversity in the regions of the species similar to that observed in other bird species that have undergone population bottlenecks (Dalton et al. 2016 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5101489/). Other diseases such as avian malaria have caused the extinction of immunologically naïve populations of birds, such as in the endemic Honey-eaters of the Hawaiian Islands.

• The United Nations Environment Programme/Convention on Migratory Species (UNEP/CMS) and the Food and Agriculture organisation (FAO) co-convened the Scientific Task Force on Avian Influenza and Wild Birds in 2005. The latest statement on H5N8 in poultry and wild birds by the Scientific Task Force on Avian Influenza and Wild Birds can be downloaded at 2 http://www.birdlife.org/sites/default/files/scientific_task_force_on_avian_influenza_and_w ild_birds_h5n8_hpai_december_2016_final.pdf#overlay-context=worldwide/policy/updateavian-influenza

• Research questions include determining the true long-distance, regional and local transmission of the virus, including possible transmission through national and international poultry trade and its by-products, and mechanisms of transmission amongst domestic, captive and wild birds. To facilitate investigations, government reports should include as much information on the bird species and numbers affected. 

• Apart from avian influenza, other viruses and bacteria can cause mass mortalities in wild birds or domesticated birds. These include, but are not limited to, botulism2, pigeon paramyxovirus, trichomonas, avian herpes viruses, avian cholera, avian malaria and also cyanobacterial blooms. 

The spread of H5N8 can be minimised through focused disease prevention and increased biosecurity at chicken and ostrich farms, as well as at zoos and bird parks. Poultry/captive/wild bird contact should be prevented as far possible. Poor biosecurity at poultry farms can lead to the contamination of the environment with the virus and it could then spread to wild birds, which will either die, or potentially act as a reservoir for highly pathogenic avian influenza strains. 

There should be no consideration of killing wild birds, spraying toxic products or negatively affecting wetland habitats as disease control measures. Such actions would contravene provincial and national legislation and international commitments made by signatory countries to the Convention of Migratory Species of Wild Animals (CMS), the agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA), the Ramsar Convention on Wetlands, and the Convention on Biological Diversity. South Africa is a signatory to the above-listed conventions. 

It should further be appreciated that wild birds are not the only potential route of transmission and that avian influenza outbreaks are usually associated with intensive domestic poultry production. Ineffective disease control and poor biosecurity will result in the continued spread in poultry populations. Further spread will result in negative conservation outcomes and the potential loss of biodiversity, as well as economic losses to farmers and national income. The current situation in South Africa is more than likely to lead to both egg and chicken shortages, critical food sources, and will impact on low-income communities the most. 

What can we do to protect our wild birds and limit the spread of H5N8? 

• Avoid areas where large colonies of birds roost, especially around waterways, or where outbreaks have been confirmed. 

• Poultry farmers should enforce strict biosecurity measures, and poultry farms should be avoided by members of the public. 

• Aviculturists and other bird keepers (pet bird owners, zoos, bird parks) should avoid any contact between captive and wild birds. 

• Report large scale bird deaths to the relevant authorities (state veterinarians and provincial nature conservation e.g. Gauteng Department of Agriculture and Rural Development in Gauteng). 

• Large numbers of carcasses should be handled by the government veterinary services. Single birds could be buried in the garden or sealed hygienically in a double bag and handed to a veterinary practise which would be willing to send it for communal incineration free of charge. 

• Avoid ringing or handling of wild birds until no further cases of H5N8 is reported in wild birds in the area, especially the ringing/handling of waterfowl or in areas near waterbodies. The disease can be transferred between birds by contaminated bird bags, ringing equipment and ringers’ hands, etc. 

The information above has been taken from (taken from various sources, including BirdLife International (see http://www.birdlife.org/worldwide/policy/update-avian-influenza). Thanks to veterinarians serving on the BirdLife South Africa Ethics Committee, Dr Philip Stapelberg and Dr Brett Gardner, for their expert opinion and input provided at the time of writing this statement. 

For more information please contact:
Dr Hanneline Smit-Robinson. Manager: Terrestrial Bird Conservation Programme/Oppenheimer Fellow of Conservation
Tel: +27 11 789 1122; +27 82 4534714; conservation@birdlife.org.za 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Images by Anton Odendal and Steve Peck of BirdLife Overberg)

 

 


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