New World Screwworm: Latest Update from USDA-APHIS

Tue, 26 Nov 2024 14:59:49 GMT

On Nov. 25, USDA’s Animal and Plant Health Inspection Service (APHIS) held a meeting to discuss the U.S. response to the news of a single case of New World Screwworm (NWS) found in a cow in Chiapas, Mexico. U.S. and Mexican officials are working closely together, but the border has been temporarily closed to live cattle imports.

“Our priority is to ensure there is no risk to our domestic industry, followed by the goal of reopening the border as soon as possible,” says Dr. Michael Watson, administrator of USDA’s APHIS.

In September, work had already begun on protocols in the event NWS was found in Mexico. Those protocols have been reviewed with Mexico for their understanding and will be made public once finalized.

Points of Protocol
Dr. Burke Healey, senior leader for policy and operations for APHIS, shared protocol will likely include pre-export inspections by Mexican veterinarians overseen by SENASICA, the equivalent to APHIS, before allowing cattle imports to resume. The inspections will make sure:

appropriate logs accompany animals coming into and leaving the facility
cattle are treated with ivermectin
there’s a seven-day quarantine period

Upon passing inspection, cattle will again be inspected by U.S. officials, along with additional inspections for tuberculosis and ticks. The cattle will be dipped, and then presented to cross the border. Healey says federal inspection sites will focus on ports in Chihuahua and Sonora.

“Those five ports are on the Mexican side, so those inspections and all of that protocol are taking place in Mexico and not on U.S. soil,” he explains.

The ports in Texas will be considered for reopening once the protocol details have been finalized and are working as expected, he adds.

Cristobal Zepeda, regional manager for North America for APHIS, says U.S. and Mexican officials maintain a close working relationship and that communication is key in this situation. Mexico had previously instituted three federal inspection points at strategic locations where cattle come into the country near the border with Guatemala and other areas.

“All animals are downloaded and inspected for wounds visually and through detector dogs,” Zepeda says. “They’re sprayed with an insecticide and receive ivermectin. The system works. That’s how it was picked up.”

Mexico has not completed its investigation but acknowledges the infested cow might have been imported from Guatemala.

While the timeline for reopening trade is tentatively estimated to be at least three weeks, it quite possibly could extend into January as Mexico typically closes ports for two weeks during Christmas and New Year’s, Healey says.

Control the Spread
The discussion also covered the potential impact on the livestock industry, which could be in the billions if NWS reaches the U.S., and the importance of sterile fly production.

The U.S. imports 1 million to 1.1 million cattle from Mexico annually. All Mexican cattle are required to have a Mexican origin ear tag and documentation of the herd of origin, TB test of that herd of origin and a TB test of the specific animals being presented for export. These requirements will remain in place.

Sterile flies from a Panama facility will be sent to Mexico to help control the spread of NWS further south and into Central America. Capacity from that facility is around 95 million per week. Mexico is also looking at retrofitting fruit fly plants to produce about 60 million sterile files a week.

The APHIS website will provide NWS updates .

Be On the Lookout
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.

If you see mammals and birds with the following signs, report them to your state veterinarian:

Irritated behavior
Head shaking
Smell of decay
Evidence of fly strike
Presence of fly larvae (maggots) in wounds

Your next read: Lidocaine Infused Bands Minimize Castration Discomfort for Young Calves

APHIS Increases Import Restrictions on Animal Products from Mexico on Confirmed Case of New World Screwworm

Mon, 25 Nov 2024 14:42:29 GMT

On Nov. 22, Mexico’s Chief Veterinary Officer informed USDA about a confirmed case of New World screwworm (NWS) in Chiapas, near the Guatemala border. These fly larvae infest warm-blooded animals, including humans, causing severe infections.

USDA’s Animal and Plant Health Inspection Service (APHIS) has heightened import restrictions on animal products from Mexico and intensified efforts in Central America to contain the pest’s spread. APHIS is collaborating with regional partners, releasing sterile flies and maintaining vigilance along the southern U.S. border.

Producers are urged to inspect livestock and pets for signs of infection, such as wounds or larvae, and report suspected cases promptly. Human infections, though rare, require immediate medical attention.

“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,” APHIS stated on the agency’s website .

Market Impact:

This will primarily impact feeder cattle imports from Mexico, and feeder cattle prices popped on the news. Mexico ships around 100,000 head a month to the U.S. The trade is seasonable, and we are on the backside of the Fall season. The restrictions are estimated to be in force for at least a month, sources note.

One trade source said, “Feeder cattle supply in the January inventory could show a 1.2 million head reduction. Anything to shorten Mexico supplies is important.”

USDA’s Preventive Measures

APHIS has taken several steps to protect U.S. livestock and wildlife from the New World Screwworm:

• Enhanced import restrictions: Stricter controls have been placed on animal products entering the U.S. from Mexico.
• Increased surveillance: APHIS is likely to have intensified monitoring at border crossings and ports of entry.
• Collaboration with Mexican authorities: USDA is working closely with Mexican officials to address the situation at its source.

Impact on Trade and Travel

The detection of New World Screwworm in Mexico and the subsequent USDA actions may have significant implications:

• Trade disruptions: Importers of Mexican animal products may face delays or restrictions.
• Travel advisories: Travelers returning from Mexico might encounter additional screening measures for pets or animal-derived goods.

Background:

New World Screwworm is a serious veterinary pest that can cause severe damage to livestock and wildlife populations. Its detection in Mexico represents a potential threat to animal health in the region, necessitating swift and coordinated action from agricultural authorities on both sides of the border.

USDA’s proactive approach underscores the importance of international cooperation in preventing the spread of agricultural pests and diseases. As the situation develops, further updates from APHIS and other USDA agencies are expected to guide stakeholders and the public on necessary precautions and compliance with new regulations.

Insects

New World Screwworm: Latest Update from USDA-APHIS

APHIS Increases Import Restrictions on Animal Products from Mexico on Confirmed Case of New World Screwworm