Tweet
Mexico Notifies United States of New World Screwworm Detection
Stakeholder Announcement
Contact:
APHISpress@usda.gov
USDA Takes Action to Prevent Spread to U.S. Animals
On November 22, 2024, the Chief Veterinary Officer of Mexico notified the United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) of a positive detection of New World screwworm (NWS) in Mexico. The NWS was found in a cow in the southern Mexico state of Chiapas, at an inspection checkpoint close to the border with Guatemala. NWS are fly larvae that infest living tissue of warm-blooded animals, causing infection.
“Given the northward movement of NWS, APHIS has in recent months stepped up its efforts in Central America to partner with impacted countries to push this pest out of newly affected areas,” said Dr. Rosemary Sifford, Chief Veterinary Officer of the United States. “With this latest find in Mexico, we will further intensify this work to protect American agriculture and reestablish the barrier in Central America.”
Given the severity of the threat from NWS, APHIS is restricting the importation of animal commodities1 originating from or transiting Mexico effective immediately and pending further information from Mexican veterinary authorities on the size and scope of the infestation. A complete list of regions APHIS recognizes as affected by screwworm and well as more detailed information on trade restrictions can be found on the USDA APHIS Animal Health Status of Regions website.
NWS maggots can infest livestock and other warm-blooded animals, including people. They most often enter an animal through an open wound and feed on the animal’s living flesh. While they can fly much farther under ideal conditions, adult flies generally do not travel more than a couple of miles if there are suitable host animals in the area.
APHIS is working with partners in Mexico and Central America to stop the spread of NWS into the United States and asking all producers along the southern border to watch their livestock and pets for signs of NWS and immediately report potential cases.
Screwworm infestations are difficult to detect at first. Check your pets and livestock for draining or enlarging wounds, and signs of discomfort. Also look for screwworm larvae or eggs. Screwworm eggs are creamy and white and are deposited on near the edges of superficial wounds. If you suspect your animal is infected with screwworm, contact your veterinarian.
While not common in humans, if you notice a suspicious lesion on your body or suspect you may have contracted screwworms, seek immediate medical attention.
Since 2006, APHIS has collaborated with Panama to maintain a barrier zone in eastern Panama, working to prevent the northward movement of NWS from South America to NWS-free areas in Central and North America. In the last two years, screwworm has spread north of the barrier throughout Panama and into Costa Rica, Nicaragua, Honduras, Guatemala and now Mexico. This increase is due to multiple factors including new areas of farming in previous barrier regions for fly control and increased cattle movements into the region. APHIS is releasing sterile flies through aerial and ground release at strategic locations throughout Central America.
APHIS will continue working with partners in Mexico and Central America to eradicate NWS from the affected areas and to reestablish the biological barrier in Panama.
To learn more about NWS, visit the APHIS website.
1 Live cattle and bison are the animal commodities impacted by this restriction.
#
...
--------------------------------------------------------------
New World Screwworm
Last Modified: November 25, 2024
New World screwworm (NWS, Cochliomyia hominivorax) is a devastating pest. When NWS fly larvae (maggots) burrow into the flesh of a living animal, they cause serious, often deadly damage to the animal. NWS can infest livestock, pets, wildlife, occasionally birds, and in rare cases, people.
NWS is endemic in Cuba, Haiti, the Dominican Republic, and countries in South America, with cases spreading north to Costa Rica, Nicaragua, Honduras, Guatemala, and now Mexico. Although USDA eradicated NWS from the United States in 1966 using sterile insect technique, there is a constant risk of re-introduction into the United States. To prevent the northward movement of this pest from South America to NWS-free areas in Central and North America, APHIS collaborates with Panama to maintain a barrier zone in eastern Panama. The cornerstone of this collaboration is the Panama-United States Commission for the Eradication and Prevention of Screwworm (COPEG). Through COPEG, we release sterile male screwworm flies in the Darien Province of eastern Panama to create a biological barrier.
NWS Outbreak in Central America and Positive Detection in Mexico
APHIS is partnering with other USDA agencies, the U.S. Department of State, the Food and Agriculture Organization of the United Nations, and affected countries to respond to an outbreak of NWS in Central America, along with a recent positive NWS detection in Mexico.
Learn More About the Outbreak in Central America and Positive Detection in Mexico
What To Look For
The name screwworm refers to the maggots' feeding behavior as they burrow (screw) into the wound, feeding as they go like a screw being driven into wood. Maggots cause extensive damage by tearing at the hosts’ tissue with sharp mouth hooks. The wound can become larger and deepen as more maggots hatch and feed on living tissue. As a result, NWS can cause serious, often deadly damage to the animal.
Adult screwworm flies are about the size of a common housefly (or slightly larger). They have orange eyes, a metallic blue or green body, and three dark stripes along their backs.
Report mammals and birds with the following signs:
Pest Alert | New World Screwworm (356.21 KB)
Brochure | New World Screwworm: What You Need To Know (6.45 MB) (also in Spanish (4.26 MB))
Poster | Screwworm: An International Threat to Human and Animal Health (958.86 KB)
Stakeholder Announcement
Contact:
APHISpress@usda.gov
USDA Takes Action to Prevent Spread to U.S. Animals
On November 22, 2024, the Chief Veterinary Officer of Mexico notified the United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) of a positive detection of New World screwworm (NWS) in Mexico. The NWS was found in a cow in the southern Mexico state of Chiapas, at an inspection checkpoint close to the border with Guatemala. NWS are fly larvae that infest living tissue of warm-blooded animals, causing infection.
“Given the northward movement of NWS, APHIS has in recent months stepped up its efforts in Central America to partner with impacted countries to push this pest out of newly affected areas,” said Dr. Rosemary Sifford, Chief Veterinary Officer of the United States. “With this latest find in Mexico, we will further intensify this work to protect American agriculture and reestablish the barrier in Central America.”
Given the severity of the threat from NWS, APHIS is restricting the importation of animal commodities1 originating from or transiting Mexico effective immediately and pending further information from Mexican veterinary authorities on the size and scope of the infestation. A complete list of regions APHIS recognizes as affected by screwworm and well as more detailed information on trade restrictions can be found on the USDA APHIS Animal Health Status of Regions website.
NWS maggots can infest livestock and other warm-blooded animals, including people. They most often enter an animal through an open wound and feed on the animal’s living flesh. While they can fly much farther under ideal conditions, adult flies generally do not travel more than a couple of miles if there are suitable host animals in the area.
APHIS is working with partners in Mexico and Central America to stop the spread of NWS into the United States and asking all producers along the southern border to watch their livestock and pets for signs of NWS and immediately report potential cases.
Screwworm infestations are difficult to detect at first. Check your pets and livestock for draining or enlarging wounds, and signs of discomfort. Also look for screwworm larvae or eggs. Screwworm eggs are creamy and white and are deposited on near the edges of superficial wounds. If you suspect your animal is infected with screwworm, contact your veterinarian.
While not common in humans, if you notice a suspicious lesion on your body or suspect you may have contracted screwworms, seek immediate medical attention.
Since 2006, APHIS has collaborated with Panama to maintain a barrier zone in eastern Panama, working to prevent the northward movement of NWS from South America to NWS-free areas in Central and North America. In the last two years, screwworm has spread north of the barrier throughout Panama and into Costa Rica, Nicaragua, Honduras, Guatemala and now Mexico. This increase is due to multiple factors including new areas of farming in previous barrier regions for fly control and increased cattle movements into the region. APHIS is releasing sterile flies through aerial and ground release at strategic locations throughout Central America.
APHIS will continue working with partners in Mexico and Central America to eradicate NWS from the affected areas and to reestablish the biological barrier in Panama.
To learn more about NWS, visit the APHIS website.
1 Live cattle and bison are the animal commodities impacted by this restriction.
#
...
--------------------------------------------------------------
New World Screwworm
Last Modified: November 25, 2024
New World screwworm (NWS, Cochliomyia hominivorax) is a devastating pest. When NWS fly larvae (maggots) burrow into the flesh of a living animal, they cause serious, often deadly damage to the animal. NWS can infest livestock, pets, wildlife, occasionally birds, and in rare cases, people.
NWS is endemic in Cuba, Haiti, the Dominican Republic, and countries in South America, with cases spreading north to Costa Rica, Nicaragua, Honduras, Guatemala, and now Mexico. Although USDA eradicated NWS from the United States in 1966 using sterile insect technique, there is a constant risk of re-introduction into the United States. To prevent the northward movement of this pest from South America to NWS-free areas in Central and North America, APHIS collaborates with Panama to maintain a barrier zone in eastern Panama. The cornerstone of this collaboration is the Panama-United States Commission for the Eradication and Prevention of Screwworm (COPEG). Through COPEG, we release sterile male screwworm flies in the Darien Province of eastern Panama to create a biological barrier.
NWS Outbreak in Central America and Positive Detection in Mexico
APHIS is partnering with other USDA agencies, the U.S. Department of State, the Food and Agriculture Organization of the United Nations, and affected countries to respond to an outbreak of NWS in Central America, along with a recent positive NWS detection in Mexico.
Learn More About the Outbreak in Central America and Positive Detection in Mexico
What To Look For
The name screwworm refers to the maggots' feeding behavior as they burrow (screw) into the wound, feeding as they go like a screw being driven into wood. Maggots cause extensive damage by tearing at the hosts’ tissue with sharp mouth hooks. The wound can become larger and deepen as more maggots hatch and feed on living tissue. As a result, NWS can cause serious, often deadly damage to the animal.
Adult screwworm flies are about the size of a common housefly (or slightly larger). They have orange eyes, a metallic blue or green body, and three dark stripes along their backs.
Report mammals and birds with the following signs:
- Irritated behavior
- Head shaking
- The smell of decay
- Evidence of fly strike
- Presence of fly larvae (maggots) in wounds
Pest Alert | New World Screwworm (356.21 KB)
Brochure | New World Screwworm: What You Need To Know (6.45 MB) (also in Spanish (4.26 MB))
Poster | Screwworm: An International Threat to Human and Animal Health (958.86 KB)
Comment