(1) "Pseudorabies" is an acute, sometimes fatal
disease, caused by a specific herpes virus and characterized by a variety of
clinical signs, involving mainly the nervous and respiratory systems. Most
species of domestic and wild animals are susceptible to infection by this viral
agent, but only swine are known to become chronic carriers. Man and higher
primates are resistant.
(2) "Department" is the Montana department of livestock, animal health
"animal" is any quadruped of a species which can become infected with
(4) An "official test" is any
department-approved pseudorabies test conducted by a person authorized by
the department and the USDA, as specifically qualified to conduct such test on
animals or animal tissues. Official tests are designed to indicate the presence
of pseudorabies infection, utilizing one or more of the following procedures:
latex agglutination (LA) , serum neutralization (SN) , florescent antibody (FA) ,
enzyme labeled immunosorbant assay (ELISA) , or any other virus isolation test
or serological procedure recognized for use in the diagnosis of
pseudorabies. To be considered
official, the test must be conducted in an approved facility. Interpretation of
test results are to be made by an individual qualified to make such scientific
judgments and who is in the employ of the department or the USDA.
Interpretation and test results are to be reported on official forms of the
"approved reagent" is a standardized biologic product approved by
USDA for use in pseudorabies testing. Use of approved reagents, which includes
antigens and test serums, are restricted to official tests only.
(6) "Official vaccination" is the administration of an approved
pseudorabies immunization biologic licensed by USDA. The administration will be
by a deputy state veterinarian or other person approved by the state
veterinarian. The vaccination will be administered only with the express permission
of the state veterinarian, and all such vaccinations will be reported on forms
provided by the department. Only official vaccination is permitted in Montana.
"official vaccinate" is an animal receiving an official vaccination
and which is given proper permanent identification.
(8) "Proper permanent identification" means use of the official nine-character
alpha-numeric eartag as provided by the
department, or individual
identification as otherwise prescribed by the department. Proper permanent
identification is required with blood samples used for official tests.
"infected or positive animal" is any animal that discloses sufficient
reaction to an official test which indicates the presence of field strain
pseudorabies virus or which is found to be infected with field strain
pseudorabies virus by other recognized diagnostic procedures.
"suspect animal" is an animal disclosing an equivocal result to an
official test or diagnostic procedure in which there is sufficient reaction,
indicating the possible presence of pseudorabies infection but is in itself
insufficient to justify classification of the animal as infected. This
classification ordinarily requires the use of additional laboratory testing
procedures to allow classification as infected or noninfected.
"noninfected or negative animal" is an animal free of clinical signs
of pseudorabies and giving a negative result to an official test designed to
detect pseudorabies infection with field strain virus.
"exposed animal" is any animal that is part of a herd or the herd
premises infected with pseudorabies, or an animal that has had sufficient
contact anywhere with pseudorabies infection or test reactors for the
transmission of pseudorabies virus to have occurred. Animals other than swine
that have not had significant contact with infected pseudorabies animals within
the previous 10 days are not considered exposed.
"herd" is one or more animals of the same species owned or supervised
by one or more persons and that permits intermingling of animals unhindered or
in which interchange of animals without regard to health status is allowed.
"contact herd" is a herd of animals of the same species that, through
epidemiological investigation, is shown to come proximal to infected or test
positive animals sufficiently for the transmission of pseudorabies virus to
occur. Also, a herd containing exposed animals.
"herd test" is a test of all animals six months of age and older
contained as a herd. Blood samples taken at the herd test will be identified to
the donor animal using proper permanent identification applied to that animal.
"random herd test" is a herd test at recognized random rates that
yield significant confidence that any infection would have been detected.
Recognized random rates are shown in the UM&R for pseudorabies eradication.
(17) "Offspring segregation plan" means a procedure whereby offspring of
pseudorabies-infected sows are segregated from those infected sows at an
age where they are passively immune to pseudorabies and by applying test and
separation principles can be developed into pseudorabies-free breeding
swine that serve as the foundation for a pseudorabies-free breeding herd
UM&R for pseudorabies
eradication herd plan manual) .
(18) "Emergency circumstances" means events or situations which, in the
opinion of the board of livestock, pose an immediate or impending economic or
livestock health danger to the livestock industry.