International movement of animals as factor in animal diseases

Animals' international movement as factor of animal diseases

Nature

International movement of animals may cause the spread of diseases which are enzootic to other countries or continents. Control measures for certain very serious diseases such as trypanosomiasis may be such that the international movement of domestic animals for purposes of cross-breeding and agricultural improvement is severely hindered, giving rise to agricultural backwardness. Many serious epidemics of malaria and bubonic plague have been caused through man's accidental transport of infected animals.

Background

The significance of international animal movement in spreading diseases emerged in the late 19th century, as outbreaks like rinderpest and foot-and-mouth disease followed trade routes across continents. With the expansion of global livestock trade and increased transport of companion and exotic animals, the 20th century saw mounting evidence of transboundary disease transmission. Heightened awareness followed incidents such as the 2001 UK foot-and-mouth epidemic, prompting international regulatory responses and ongoing surveillance initiatives.

Incidence

Diseases caused by the international movement of animals may arise from the migration of wild animals or the import of either wild or domestic animals. The search for improved breeds of domestic stock such as cattle, sheep and pigs leads to cross-breeding and the importation of foreign breeds. The popularity of zoos in developed countries has led to an increase in the importation of wild animals which may set up diseases, as has the increased demand for exotic pets. Diseases from imported livestock in the USA include anthrax, scab, mange, blackleg, tuberculosis, fowl plague, fowl pox, and tick fever.

Counter-claim

The idea that international movement of animals is a significant factor in animal diseases is vastly overstated. Modern biosecurity, strict regulations, and advanced veterinary screening make disease transmission through animal trade negligible. Focusing on this issue diverts attention from more pressing concerns like local hygiene and wildlife reservoirs. In today’s world, the international movement of animals is not an important problem and should not be prioritized in disease prevention strategies.