Why Feral Hogs are the Ultimate Disease “Super-Spreaders”

The article A $1.6 Billion Biological Threat: Why Wild Boars Are the Ultimate Disease ‘Superspreaders’ appeared first on AZ Animals.

Quick shot

• eradicate US$1.5 billion Agricultural threats need to be managed 6.9 million Invasive hybrids 35 states.

• this 10-30 days life cycle New World Screwworm Causes fatal tissue damage to warm-blooded hosts.

• African swine fever still invisible warthogThis despite causing deadly outbreaks in domestic pig herds.

• activation National Pig Health Strategy It is necessary to monitor Early detection Emerging exotic pathogens.

It’s no secret that wild pigs are bad news for America’s ecosystems. But now they pose an additional threat. These pigs could spread two new devastating diseases, the consequences of which could cause huge losses to U.S. agriculture. We examine the threat these two diseases would pose to U.S. agriculture if they entered feral swine populations and what steps are being taken to prevent this from happening. This is what we found.

Wild boars are destroying ecosystems

wild boar (wild boar) Brought to America by European settlers in the 1500s. In the 1900s, more hunting dogs were introduced for sport hunting. They soon interbred with escaped domestic pigs, so that today’s wild boars are actually domestic pigs, wild boars, and hybrids of the two. Currently, there are approximately 6.9 million people living in at least 35 states.

They reproduce rapidly, live in groups, and eat almost anything, including food crops. This makes them extremely unpopular with farmers, causing at least $1.5 billion in losses each year. Wild boars also eat tree roots, nuts, bird eggs, and small carrion. They destroy the habitat of other animals by uprooting plants and displacing soil. There are ongoing concerns that they can spread diseases to wildlife, livestock and even humans. However, two diseases, African swine fever and New World screwworm, are currently causing great concern.

African swine fever and wild boars

As the name suggests, African swine fever originated in sub-Saharan Africa. It is caused by a virus and may have originated in warthogs, which can carry the virus without showing any symptoms. The disease can also infect domestic pigs and is highly contagious and fatal.

It was introduced to Eurasia in 2007 and has since infected domestic pig and Eurasian wild boar populations. It’s not yet recognized in the United States (it’s considered an exotic animal disease), but it’s slowly getting closer. In 2021, it was discovered in the Dominican Republic and Haiti. The USDA remains alert for signs of domestic swine and feral swine populations.

Threats to domestic pig industry

Meanwhile, the domestic pig industry is concerned that wild boar populations will serve as potential vectors for the disease if it enters the country. The virus is spread through contact with body fluids of infected pigs. It can also be spread through contaminated feed, garbage feeding (eating discarded pork), and contact with infected carcasses in the environment. People may inadvertently transmit the virus to domestic pigs through footwear, clothing or infected meat products. Currently, there is no vaccination and no treatment.

If the disease entered wild boar populations, eradication would be extremely difficult and would threaten domestic pigs. They develop frightening symptoms including loss of appetite, red spots on the skin, weakness, diarrhea, vomiting, coughing and difficulty breathing. Most cases are fatal. Infection of domestic pigs in the United States will lead to pork shortages, trade disruptions and significant economic impact. Thankfully, humans cannot contract the disease, so there is no direct threat to public health.

What is New World screwworm?

New World Screwworm (armor-eating fly) is a parasitic fly. Their average life cycle lasts 10-30 days, starting when adults mate. The female then lays her eggs on the edge of an open wound or exposed tissue of a warm-blooded host. This can be a human, pet, livestock or wild animal. Flies get their name from the way their larvae “twist” into flesh with their sharp bill hooks. The larvae hatch and burrow into the wound, feeding on living tissue. After about a week, the mature larvae drop to the ground and pupate in the soil. In warmer temperatures, pupation occurs more quickly, and then the adults emerge and repeat the cycle.

Screwworms cause problems for livestock due to the damage caused by the larvae. Flies are attracted to cuts, scratches, surgical sites, eyes, ears, nose, and soft tissue around the belly button and genitals. The damage they cause, known as myiasis, attracts more flies to lay eggs and cause infection. If left untreated, the infection can be fatal.

This parasite once existed in the United States but was eradicated in 1966 by an innovative sterile fly program developed by the USDA. Currently, New World screwworm is not found in the United States, but it is present in South America. There has been an outbreak among the Key deer population in the Florida Keys, but it has never spread to the mainland.

National Pig Health Strategy

The National Pork Producers Council (NPPC) and state pork associations are developing a national swine health strategy. This is a producer-driven effort to protect and improve the health of the U.S. swine herd. The strategy is driven by the looming threat of exotic animal diseases such as African swine fever and New World screwworm. One of the goals is to keep exotic and emerging diseases at bay through prevention and preparedness methods. Another function is monitoring and early detection of emerging diseases. Continued vigilance is necessary to prevent wild pigs from causing greater economic damage in the future.

The article A $1.6 Billion Biological Threat: Why Wild Boars Are the Ultimate Disease ‘Superspreaders’ appeared first on AZ Animals.