Foot-and-mouth disease

Clinical symptoms appear rapidly, starting with high fever (up to 41-42°C), extreme lethargy, and a sudden drop in appetite, causing the animal to stop eating entirely.

Characteristic signs include excessive salivation and smacking of the lips. Upon examination, fluid-filled vesicles (aphtae) are visible on the tongue, gums, and oral mucosa, which eventually rupture to form painful ulcers.

Lameness is another common indicator, as vesicles form in the interdigital space and around the coronary band of the hooves. This results in significant pain, making it difficult for the animal to stand or walk.

In lactating dairy cows, the virus causes lesions on the teats, leading to mastitis and a total cessation of milk production. This often leaves the animal permanently compromised even after recovery.

• Sudden fever and depression.
• Excessive frothy salivation.
• Blisters and ulcers in the mouth.
• Severe lameness due to hoof lesions.
• Dramatic decrease in milk yields.

Foot-and-mouth disease (FMD), caused by the Aphthovirus, is a highly contagious viral disease affecting cloven-hoofed animals. It is important to note that this is a major livestock disease, distinct from any plant-pathogenic viruses.

The causative agent belongs to the Picornaviridae family and is characterized by a significant number of serotypes. This genetic diversity makes the development of effective vaccines a continuous global challenge.

The virus exhibits remarkable environmental stability. It can persist in manure, soil, and animal products for weeks, allowing it to survive through various climatic conditions.

Transmission occurs through direct contact between animals, exposure to contaminated feed and water, and even through mechanical transport on clothing, footwear, and vehicles.

Biologically, the virus targets epithelial tissues, leading to the systemic development of vesicles, known as aphtae, which are the hallmark of this severe clinical infection.

Outbreaks are most common in areas with high livestock density, where close animal-to-animal proximity facilitates the rapid transmission of the airborne virus.

Climatic factors such as cool and humid environments are ideal for the virus to remain infectious on surfaces for extended periods, complicating decontamination efforts.

Human-mediated movement of livestock remains the primary driver of spread. Moving animals from infected regions without proper quarantine measures is the most frequent cause of new outbreaks.

Wind patterns can carry the virus over long distances in specific atmospheric conditions, potentially infecting healthy herds situated miles away from an initial outbreak.

Lack of rigorous biosecurity protocols at livestock markets and slaughterhouses provides a constant risk of spreading the pathogen to previously unaffected agricultural regions.

FMD causes devastating economic impacts on the agricultural sector. Costs arise from animal losses, reduced meat and milk production, and the massive expense of eradication campaigns.

International trade bans are immediately imposed on countries with active FMD cases, causing immense losses for farmers and the national economy by closing export markets for livestock products.

Beyond immediate losses, the long-term impact includes decreased fertility, chronic mastitis, and stunted growth in young stock, leading to further economic degradation of the herd.

Food security is frequently threatened, as large-scale culling programs are often implemented to curb the spread, drastically reducing the availability of domestic animal protein.

The psychological stress on farming communities, combined with restrictive movement orders, significantly disrupts rural life and agricultural business operations.

Vaccination programs are the cornerstone of FMD control. Systematic immunization helps build herd immunity and prevents widespread epidemics in vulnerable geographic areas.

Strict quarantine protocols are mandatory following an outbreak. All movement of animals and animal-derived products must be halted immediately until the area is confirmed safe.

Rigorous disinfection of facilities and equipment is critical. The virus is sensitive to specific disinfectants, including alkaline solutions, which must be applied to all high-contact surfaces.

Implementing strict biosecurity measures, including the 30-day quarantine for all new arrivals, is essential for every farm to prevent the entry of the pathogen into the herd.

Continuous veterinary surveillance and rapid diagnostic testing enable early identification of potential cases, allowing for immediate isolation and preventing the entire herd from becoming infected.