Biosecurity is a major responsibility of the farm health team, and awareness of the ease of disease spread is required for all members of the team. It is impossible (at present) to prevent the transmission of some diseases, for example, various serotypes of Escherichia coli or earth-borne pathogens such as Erysipelothrix rhusiopathiae. Some diseases may spread long distances through the air, for example, parvovirus. Other pathogens are only locally spread. Mycoplasma hyopneumoniae, for example, will affect farms within a 3-km zone. However, for farms located in an area of low farm density, maintenance of a M. hyopneumoniae-free status has been possible for more than 20 years.[2] Some diseases, such as Sarcopties scabiei var suis, require direct pig contact. With modern avermectin therapies, eradication of mange on pig farms is achievable. Adequate biosecurity is the responsibility of the entire pork production chain, from the nucleus and multiplication farms, with their artificial insemination (AI) studs, to the family farm. A pathogen that is absent from the farm or area, such as pseudorabies (Aujeszky's diseases), does not require treatment or prevention. Indeed, the absence of pathogens allows for more errors in environmental management before production suffers.

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