African swine fever is spreading fast and eliminating it will take decades

06.06.2019 254 views
The deadly pig virus that jumped from Africa to Europe is now ravaging China’s $128 billion pork industry and spreading to other Asian countries, an unprecedented disaster that has prompted Beijing to slaughter millions of pigs. But stopping African swine fever isn’t so easy. The virus that causes the hemorrhagic disease is highly virulent and tenacious, and spreads in multiple ways. There’s no safe and effective vaccine to prevent infection, nor anything to treat it. The widespread presence in China means it’s now being amplified across a country with 440 million pigs—half the planet’s total—with vast trading networks, permeable land borders and farms with little or no ability to stop animal diseases. Transcontinental Contagion
Source: OIE, as of May 23 2019
The number of pigs China will fatten this year is predicted to fall by 134 million, or 20%, from 2018—the worst annual slump since the U.S. Department of Agriculture began counting China’s pigs in the mid-1970s. While the pig virus doesn’t harm humans even if they eat tainted pork, the fatality rate in pigs means it could destroy the region’s pork industry.

Culling in China

Source: Bloomberg Data
Spain’s experience with the disease suggests that a cull alone won’t be enough to solve the problem. The country implemented strict sanitary measures and industrialized its hog production system but it took 35 years and help from the European Union before the disease was eradicated in 1995. The Italian island of Sardinia has been trying unsuccessfully to get rid of the virus for four decades, and its hog population is a fraction of China’s. Multiple Routes
Main sources of African swine fever into Europe

Source: J.M. Sánchez-Vizcaíno, et al, 2014, OIE
Mystery Source
One of the reasons why African swine fever is so hard to eradicate is that it’s easy to transmit. In addition to direct contact with an infected pig, the virus can be passed on to animals that eat virus-laden pork or feed, via contaminated clothing or equipment or when a pig drinks water containing even minute quantities of the virus.Studies show that the strain in China closely resembles one that’s been spreading in Russia and other parts of Europe for more than a decade. But scientists still don’t know the route it took to get into the world’s most populous nation. Without knowing how the virus got in, China’s customs officials will have a harder time preventing repeated introductions. The disease is now in Mongolia, Vietnam, North Korea and possibly other neighboring countries that lack the resources to identify and control the disease. That increases the risk that, even if China does manage to control the disease domestically, it could re-enter the country via people or pork products that cross the border.
Dirty Garbage
Scientists say the virus may have arrived in China the same way it entered Europe in early 2007. A United Nations report suggests some food-waste containing pork was dumped from a ship visiting the port of Poti on the Georgian Black Sea and then eaten by one of the local pigs that are allowed to scavenge on garbage. Within weeks, 30,000 pigs had died and 80 percent of Georgia’s districts were thought to be infected.
Pigs and their feral wild-boar cousins are quintessential waste disposal units, guzzling on protein from a wide variety of sources, including kitchen scraps, manure and dead hogs. While the omnivorous nature of the animals makes them low-cost nutrient converters, it’s also a key reason that African swine fever spreads easily. A review of outbreaks showed that almost half were caused by the spread of virus material on vehicles and on non-disinfected workers, with feeding pigs contaminated swill or food scraps the second-biggest source. Feeding raw swill to pigs has been outlawed in China because of the risk of disease transmission, but clandestine use of non-heat-treated restaurant and household waste is reported to persist among suburban and smallholder farmers. About half of China’s producers raise fewer than 500 hogs each. Sticky Germs Epidemiological studies of 68 outbreaks in China revealed three major causes of spread

Source: China’s Ministry of Agriculture and Rural Affairs

So far, government efforts to halt the spread through quarantining and sanitizing infected farms, culling vulnerable pigs, closing markets and restricting the movement of hogs have been insufficient, and the disease has become entrenched across the country.
Surreptitious
The virus is also hard to track. Pigs may incubate it for five to 15 days and can shed infectious particles for one to two days before falling ill. That means the virus can be silently spread in the waste, meat and blood of infected pigs that don’t appear to be sick, especially when they are illegally transported or slaughtered before diagnosis.In China, pigs are routinely trucked hundreds of miles as farmers and traders seek to take advantage of regional differences in livestock and meat availability and prices, as well as a preference for fresh meat. When hogs arrive at a new farm, they are typically mixed immediately with other swine, facilitating transmission of the disease.
Hiding Outbreaks
Identifying outbreaks early is critical for mitigating their spread. The Chinese government has pledged to pay a subsidy of 1,200 yuan per pig to compensate farms for losses, but some local governments are reported to be withholding payments—removing an incentive for farmers to report the disease.In some instances, individuals have even been punished for publicizing outbreaks. A hog manager in Shandong province was allegedly arrested for reporting infected pigs to the national government after his efforts to alert local officials were ignored.
Saturated Blood
The virus, though, doesn’t need traveling swine to spread. A single drop from an acutely infected pig can contain 50 million virus particles, and just one of those particles ingested in contaminated drinking water may be enough to transfer the disease to another pig.
Infected blood, or fluids from urine, saliva or feces, can be carried in dirt on truck tires and shoes, allowing the disease to travel hundreds of miles quite rapidly. Contaminated sources require heating to 60 degrees Celsius (140 Fahrenheit) for 30 minutes to be rendered safe. Tens of thousands of swine have been infected in China and their carcasses represent an enormous environmental risk, requiring careful handling and disposal. In Romania, the contamination of the Danube River from dead hogs was implicated in the virus’s spread to a 140,000-pig farm.
Tough Survivor
The germ is hardy, capable of remaining active in water for a month, in meat and blood at room temperature for several months and for six years in cold, dark conditions. It’s resistant to temperature extremes, and can survive a day in vinegar-strength acids.

Stealthy Bug

African swine fever can survive temperature and pH extremes
Sources: OIE, M.C. Niederwerder et al, S. Farez et al, K. Davies et al, European Food Safety Authority
There are no published studies reporting the incidence of African swine fever virus detected in food in China. But the virus has been in Chinese pork products that were confiscated by customs officials in Japan, South Korea and Australia, suggesting that the virus has permeated the food chain in China. Even if China is able to stop the virus transmitting from pig to pig, two other disease vectors may frustrate eradication efforts: wild boars and Ornithodoros ticks. These are the natural hosts of African swine fever virus and are widely distributed in China, though it’s not yet known what role they are playing in spreading the disease there. Zhejiang province, south of Shanghai, has about 150,000 wild boars.
A pork stall at a market in Hanoi, Vietnam
Workers in protective gear spray disinfectants at a pig farm in Jinhua, Zhejiang province, China, on Aug. 22, 2018. Source: VCG via Getty Images
No Vaccine
Despite 50 years of research, scientists haven’t managed to develop a vaccine that’s safe and effective against African swine fever, and even if recent research proves fruitful, it could be years before an effective shot becomes commercially available.One of the earliest attempts—based on a live, weakened form of the virus—was abandoned after it was found the vaccine gave pigs a debilitating and disfiguring disease. Studies have found that the animals which recover from an initial African swine fever infection are resistant to some other strains, but scientists aren’t sure what exactly confers that protection or how best to evaluate the potential efficacy of candidate vaccines. One of their difficulties is that the large, complex DNA virus that causes African swine fever has some 170 genes and 80 proteins, many of them specialized in evading different aspects of the pig immune system. More recent attempts to produce an immunization using viruses that lack key disease-causing genes appear to be safe. Still, researchers are yet to carry out large field trials to demonstrate effectiveness in commercial farms—a necessary step for gaining regulatory approval. That may delay the availability of game-changing vaccines for years. With a tough virus to eradicate and no vaccine on the horizon, the best way China can protect its domestic pork industry from African swine fever is to carefully monitor and control the germs on every pig, person and product entering and leaving hog farms. That would mean turning China’s 26 million piggeries into veritable biocontainment facilities. Source - https://www.bloomberg.com
27.03.2024

Turkey - Climate change may affect grape cultivation

A recent study has highlighted the impact of the climate crisis on viticulture in Turkey, predicting that the expected rise in temperatures and reduced rainfall could shift the suitability of vineyard regions for grape production over the next three decades.

27.03.2024

Crop crisis reveals El Niño’s toll on Southern Africa

New findings from the El Niño-Southern Oscillation (Enso) reference group highlight the significant impact of the 2023/24 El Niño event on various aspects of climate and agriculture in Southern Africa.

27.03.2024

Philippines - Crop losses reach P80M as drought hits Negros Oriental

As the El Niño phenomenon worsens in Negros Oriental, damage to rice, corn, and other high-value crops has reached more than PHP80.4 million, the Department of Agriculture-Provincial Agriculture Technology Coordinating Office (DA-PATCO) said Tuesday.

27.03.2024

USA - Farmers say coverage has become unavailable or unaffordable as drought and floods increasingly threaten their crops

Farmers who grow fresh fruits and vegetables are often finding crop insurance prohibitively expensive — or even unavailable — as climate change escalates the likelihood of drought and floods capable of decimating harvests.

27.03.2024

India - Telangana Minister assures financial support for rain-affected farmers

Telangana Excise and Prohibition Minister Jupally Krishna Rao has assured the farmers that the government is committed to providing financial help to the cultivators whose crops were damaged due to unseasonal rains.

27.03.2024

Australia - Managing canola pests using beneficial insects, spiders and mites

Australian grain growers will benefit from improved pest management strategies with the commencement of two new research projects focusing on beneficial insects (beneficials) in canola.

27.03.2024

USA - Early blooms indicate strong fruit year if frost, freeze can be avoided

Warm temperatures in late February and early March have led fruit trees across Virginia to blossom early. Based on what growers are seeing, the number of blooms indicate at banner crop. However, there is a risk a portion of that crop could be wiped out by a freeze or frost.

27.03.2024

USA - As winters warm, Wisconsin fruit growers brace for the worst

On a cool, early spring morning in March, Liz Griffith stands among her apple trees, reaching to the very highest branches with a pole saw. Birds that have already returned north call to each other over the “snip snip” of shears, as Griffith and her staff prune through eight acres of apple trees on her orchard in Cottage Grove.

istanbul escort şişli escort tbilisi escort şişli escort şişli escort maslak escort istanbul escort beşiktaş escort taksim escort izmir escort ümraniye escort mecidiyeköy escort şişli escort taksim escort ümraniye escort kartal escort şirinevler escort maltepe escort istanbul escort ümraniye escort kadıköy escort vip escort mersin escort istanbul escorts ataköy escort avcılar escort beylikdüzü escort okmeydanı escort şişli escort tuzla escort işitme cihazı sex shop sex shop sex shop sex shop sex shop sex shop sex shop sex shop