Listed Disease

African swine fever

Responsible for massive losses in pig populations and drastic economic consequences, African swine fever (ASF) has become a major crisis for the pork industry in recent years. Currently affecting several regions around the world, and with no effective vaccine, the disease is not only impeding animal health and welfare but has also detrimental impacts on biodiversity and the livelihoods of farmers. The World Organisation for Animal Health (WOAH) works with its partners, industry and experts to support countries in their efforts to prevent and control this devastating pig disease.

What is African swine fever?

African swine fever (ASF) is a highly contagious viral disease of domestic and wild pigs, whose mortality rate can reach 100%.  

It is not a danger to human health, but it has devastating effects on pig populations and the farming economy. There is currently no effective vaccine against ASF. 

The virus is highly resistant in the environment, meaning that it can survive on clothes, boots, wheels, and other materials. It can also survive in various pork products, such as ham, sausages or bacon. Therefore, human behaviours can play an important role in spreading this pig disease across borders if adequate measures are not taken.

African swine fever: a socio-economic burden and a threat to food security and biodiversity 

Pigs are a primary source of household income in many countries. The spread of ASF across the world has devastated family-run pig farms, often the mainstay of people’s livelihoods and a driver of upward mobility. It has also reduced opportunities to access healthcare and education.  

Moreover, pork meat is one of the primary sources of animal proteins, accounting for more than 35% of the global meat intake1. Hence, this disease poses a serious problem for food security worldwide. 

This disease is also a concern for biodiversity and the balance of ecosystems, as it affects not only domestic farmed pigs, but also wild boars, including native breeds.  

Protecting local livelihoods in Laos

Bounmee is into small scale pig farming, a common activity in Laos. With a total of 1,055 pigs, Bounmee and her family heavily depend on this activity as their source of income. Yet, her pig farming business took an unexpected turn in 2019, when African swine fever (ASF) hit her country for the first time. She lost all 1,055 pigs to this disease in 2019, impacting negatively on her financial resources to cater for her entire family. 

Learn more on how we have collaborated with the national Veterinary Service to support pig farmers like Bounmee in Laos.

Global situation 

ASF continues to spread worldwide, threatening pig health and welfare. The disease has reached multiple countries across Asia, the Caribbean, Europe, and the Pacific, affecting both domestic and wild pigs.

Know more about the current disease situation: 

Act to stop the spread  

From farmers to travellers, all those who might be in direct or indirect contact with pigs, wild boars or pork products can contribute to stopping the spread of this deadly pig disease. 

You work in the animal health sector

Here is what you can do

You work in the travel sector

Help us raise awareness

You are a citizen interested in helping

Learn more

1 FAO Food Outlook 2019 

Situation reports for African swine fever (ASF) 

These reports provide an update of the ASF situation at both global and regional levels, according to the information submitted by countries through the World Animal Health Information System (WOAH-WAHIS). 






Global situation (2016-2019)

Keeping transparency on the disease situation 

Maintaining transparency on the global situation of African swine fever is key to facilitate the implementation of early measures that could halt the spread of the disease.   

ASF is an WOAH-listed disease. It is therefore mandatory for national Veterinary Authorities to notify the WOAH of any ASF case in a timely manner. At the same time, countries may also self-declare the absence of ASF from their territory on a voluntary basis.  

Prevention is essential 

In the absence of an effective vaccine, prevention in ASF-free countries depends on implementation of appropriate import policies and biosecurity measures, ensuring that neither infected live pigs nor pork products are introduced into ASF-free areas.  

This includes ensuring proper treatment and disposal of waste food from aircraft, ships or vehicles coming from affected countries and policing illegal imports of live pigs and pork products from affected countries. 

At farm level, the following key biosecurity principles should be implemented to keep animals healthy.

Control measures to halt ASF spread 

During outbreaks and in affected countries, controlling the spread of African swine fever can be difficult and must be adapted to the specific epidemiological situation.  

General sanitary measures that may be implemented include:  

  • early detection and humane killing of animals (with proper disposal of carcasses and waste),  
  • thorough cleansing and disinfection,  
  • zoning/compartmentalisation and movement controls,  
  • surveillance and detailed epidemiological investigation, and  
  • strict biosecurity measures on farms. 

As observed in Europe and in some regions of Asia, where wild boar play a significant role in the transmission of ASF, the management of this wild population density and their interaction with low-biosecurity pig production systems is key. The good knowledge and management of the wild boar population and a good coordination among the Veterinary Services, wildlife and forestry authorities are required to successfully prevent and control ASF.  

Check our technical guidelines: 

A global threat   

African swine fever (ASF) has never been so widespread. Due to its complex epidemiology, the disease has expanded relentlessly since 2018, affecting more than 50 countries2

In the absence of an effective vaccine, controlling and eradicating ASF becomes more challenging. Despite this daunting context, global control of the disease is possible with sustained effort and collaboration at national, regional and international levels, as evidenced by countries that have succeeded in eradicating the disease. 

Today, no country is safe from ASF. The number of countries reporting outbreaks to the WOAH continues to grow. This corresponds to the biggest animal disease outbreak of our generation.  Sustained investment in Veterinary Services, and the effective implementation of international standards, are needed to bring ASF under global control.

Dr. Monique Éloit
Director General for the World Organisation for Animal Health (WOAH, founded as OIE)

Towards the global control 

The WOAH and the Food and Agriculture Organization of the United Nations (FAO) have developed a joint initiative for the Global Control of ASF. This initiative, launched under the umbrella of the Global Framework for the progressive control of Transboundary Animal Diseases (GF-TADs), brings together governments, industry and specialists to support our Members in their effort to control this devastating pig disease. 

The objectives are to:

Improve the capability of countries

to control (prevent, respond, eradicate) ASF using WOAH standards and best practices that are based on the latest science.

Establish an effective

coordination and cooperation framework for the global control of ASF. 

Facilitate business continuity. 

Global Control on African Swine Fever

Learn more about the efforts at regional level



Asia and the Pacific


2 As of May 2021 

You are a citizen interested in knowing more about ASF and what you can do

Concrete actions you can take:

When travelling 

  • Avoid carrying pork products or declare them to the transport authorities 
  • Keep away from pig farms and wild pigs, unless strictly necessary  
  • Do not feed pigs with food waste or kitchen scraps containing meat products 

When hunting 

  • Clean and disinfect your equipment on site 
  • Do not leave food for wild boar 
  • Clean and disinfect your hunting trophies before leaving the area 

Your main resources:

You work in the travel sector, help us spread the word on ASF

You work with pigs. Follow the recommendations 


  • Declare any suspicious case (dead or alive) to the Veterinary Authorities 
  • Do not feed untreated swill or kitchen scraps containing meat to your pigs 
  • Implement biosecurity measures in your farm and at markets 


  • Recognise ASF clinical signs 
  • Confirm your diagnosis by laboratory test 
  • Notify national Veterinary Authorities 

Technical resources

Other technical resources


Panorama 2020-1: African swine fever: responding to the global threat



GF-TADs web page on African Swine Fever


Regional resources



Asia and the Pacific


You are a journalist, check our publications and events on ASF


African swine fever threatens an entire production system in South-East Asia – Opinion piece by Dr Monique Eloit, WOAH Director General, published in iD4D in September 2020 

News and Events

What is ASF?

African swine fever is a highly contagious haemorrhagic viral disease of domestic and wild pigs, responsible for serious production and economic losses due to its high mortality rate and the control measures implemented by affected countries. It is caused by a DNA virus of the Asfarviridae family. 

Although signs of ASF and classical swine fever (CSF) may be similar, the ASF virus is unrelated to the CSF virus. 

ASF does not affect human health. 
Although signs of ASF and classical swine fever (CSF) may be similar, the ASF virus is unrelated to the CSF virus. 

ASF does not affect human health. 

What are the clinical signs of ASF?

Clinical signs and mortality rates can vary according to the virulence of the virus and the type/species of pig: 

Acute forms are characterised by high fever, depression, anorexia and loss of appetite, haemorrhages in the skin (redness of skin on ears, abdomen and legs), abortion in pregnant sows, cyanosis, vomiting, diarrhea and death within 6-13 days (or up to 20 days). Mortality rates may be as high as 100%.  

Subacute and chronic forms are caused by moderately or low virulent viruses, which produce less intense clinical signs that can be expressed for much longer periods. Mortality rates are lower but can still range from 30-70%. Chronic disease symptoms include weight loss, intermittent fever, respiratory signs, chronic skin ulcers and arthritis. 

Different types of pig may have varying susceptibility to ASF virus infection. African wild suids may be infected without showing clinical signs, allowing them to act as reservoirs.

Where does ASF come from? 

African swine fever has traditionally been present in Africa, until 1978 when the disease was introduced to the Italian island of Sardinia. In 2007, the disease was confirmed in the Caucasus region of Georgia and, from there, the ASF virus gradually spread to neighbouring countries affecting domestic pigs and wild boar.  
The first occurrence of ASF in the European Union (EU) was reported in 2014 and since then, numerous EU countries have been affected by this devastating pig disease. Yet, two European countries have also managed to eradicate it:
Belgium (March 2020) and Czech Republic (April 2018).  
In 2018, the virus leapt to China (People’s Rep. of), representing the first occurrence of ASF in Asia. Since then, the disease has continued to spread in this region and in Oceania.  
In July 2021, the disease reappeared in the Americas after an absence of almost 40 years, having been introduced in Dominican Republic and later in Haiti. 

Access the latest updates on the current situation.

How does ASF spread? 

The epidemiology of ASF is complex and varies depending on the environment, types of pig production systems, the presence or absence of competent tick vectors, human behaviour, and the presence or absence of wild pigs. 
Routes of transmission can include: 
– direct contact between infected pigs, domestic or wild; 
– ingestion of material contaminated with the virus (e.g. food waste, feed, or garbage); 
– contact with contaminated fomites (such as clothing, footwear or vehicles), or  
– bite of biological vectors (soft ticks of the genus Ornithodoros), where present. 

How is ASF diagnosed? 

African swine fever may be suspected based on clinical signs, but confirmation must be made with laboratory tests, particularly to differentiate it from classical swine fever (CSF). Guidance on diagnostic tests for ASF can be found in the Manual of Diagnostic Tests and Vaccines for Terrestrial Animals. 

Is there a cure for ASF? 

Despite several research studies are ongoing, currently there is no effective treatment nor vaccine against ASF.  
Any type of ‘ASF vaccine’ sold on markets is fake. As these are illegally manufactured, they are not subject to the usual vaccine evaluation protocols and may contain poorly attenuated strains of the virus, which poses serious safety risks and have the potential to spread between pigs, resulting in chronic forms of the disease. 

Can humans get ASF? 

ASF is not a risk to human health. 

It is safe to eat pork? 

Humans do not get sick from African swine fever. The disease cannot be transmitted to humans through contact with pigs or by consuming pork products. However, meat contaminated with the ASF virus should not be used to feed pigs, as pigs can get infected this way. It is therefore recommended to avoid feeding pigs with food scraps or kitchen waste that have not been properly treated.  

Should cases of ASF be notified to the WOAH? 

ASF is an WOAH-listed disease.  It is therefore mandatory for national Veterinary Authorities to notify the WOAH of any ASF case in a timely manner. At the same time, countries may also self-declare the absence of ASF from their territory on a voluntary basis. 
Maintaining transparency on the global situation of African swine fever is key to facilitate the implementation of early measures that could halt the spread of the disease. 

How can we prevent ASF? 

Biosecurity is the most important and effective measure available to prevent and control African swine fever. Rigorous and continuous implementation of biosecurity principles at farm level, as well as increasing vigilance at borders to prevent the illegal movement of ASF-infected animals or commodities, can halt the virus from entering pig herds. 
It is equally important that all those who might be involved in the direct and indirect transmission of ASF are made aware and acknowledge the importance and potential consequences of their actions. In this scenario, efficient risk communication becomes also an essential component of the disease prevention efforts. To support countries, the WOAH, jointly with the Food and Agriculture Organization of the United Nations (FAO), has developed an awareness campaign that targets different actors who are susceptible to play a role in the spread of the disease. Hunters, small pig farmers and large commercial pig producers, as well as travellers and the transport industry, are called upon to be actively engaged in curbing the spread of this deadly pig disease. 

Can African swine fever be controlled? 

Despite the complexity and challenging characteristics of ASF, its global control is possible with sustained effort and collaboration at national, regional and international levels. For this reason, in 2020, the WOAH launched the Initiative for the Global Control of ASF in partnership with the Food and Agriculture Organization (FAO), under the umbrella of the Global Framework for the Progressive Control of Transboundary Animal Diseases (GF-TADs). Its goal: bringing together governments, industry and experts to support our Members in their effort to control this devastating pig disease. 

What are the WOAH’s goals regarding ASF control? 

To achieve global control, ASF requires adequate risk management through the development and implementation of national control programmes. Through the Initiative for the Global Control of ASF, the WOAH and FAO aim to improve the capability of countries to prevent, respond to and eradicate the disease using WOAH International Standards and best practices that are based on the latest science available. The goal is also to establish an effective coordination and cooperation framework for the control of ASF at global, regional and local level and to facilitate business continuity while ensuring safe production and trade to protect food systems.