| (3) Cervidae herds that have had a test of all eligible
animals with NGL reactors only and no evidence of tuberculosis infection
is found by histopathology and culture of M. bovis (including selected
NGL specimens submitted from animals having no gross lesions indicative
of tuberculosis) may be released without further restrictions.
(4) Cervidae herds in which compatible or suggestive
lesions are found by histopathology without the isolation of M. bovis
may be released from quarantine following a negative 90-day retest
of the entire herd, provided there is no known association with M.
bovis.
(5) Cervidae herds that exhibit NGL reactors in which
no evidence of tuberculosis infection is found by histopathology and
culture of M. bovis and are unable to conduct a test of all eligible
animals, shall be evaluated by the state and/or regional tuberculosis
epidemiologist for possible release of quarantine.
(h) Procedures in affected herds. Disclosure of tuberculosis
in any herd shall be followed by a complete epidemiological investigation.
All cervids in herds from which tuberculosis animals originate, and
all cervids that are known to have associated with affected cervids
or other affected animals, shall be tested promptly. These procedures
shall apply to adjacent and contact herds as well as to the evaluation
and testing of possible source herds for the affected herd. Herds
that have received exposed animals shall be tested following the slaughter
or testing of the exposed animals. Every effort shall be made to ensure
the immediate elimination of the disease from all species of animals
on the premises. The herd shall be handled as outlined under subsection
(g) of this section.
(i) Retest Schedules for High Risk Herds.
(1) In herds with a history of lesions compatible or
suggestive for tuberculosis by histopathology, two complete annual
herd tests shall be given after release from quarantine. Herds with
a bacteriologic isolation of a Mycobacteria species other than M.
bovis should be considered negative for bovine tuberculosis with no
further testing requirements.
(2) In a newly assembled herd on premises where a tuberculosis
herd has been depopulated, two annual herd tests shall be applied
to all animals. The first test must be approximately six months after
assembly of the new herd. If the premises are vacated for over one
year, these requirements may be waived.
(3) Exposed animals previously sold from known infected
herds shall be depopulated if possible, or tested with the SCT or
Stat Pak/DPP by State or Federal veterinarians. All animals non-negative
to either test shall be classified as reactors.
(A) If bovine tuberculosis is confirmed in the exposed
animal(s), the remainder of the receiving herd shall be classified
as an infected herd and handled according to subsection (g)(2) of
this section.
(B) If negative to the test, the exposed animal(s)
will subsequently be handled as if a part of the infected herd of
origin for purposes of testing, quarantine release, and the five annual
high-risk tests. The remainder of the herd shall be tested at the
time of the initial investigation and retested in one year with the
SCT or Stat Pak/DPP. Supplemental diagnostic tests may be used if
needed.
(4) Herds indicated as the source(s) of animals in
slaughter traceback investigations shall be placed under quarantine
within 30 days of notification to the area office, and a herd test
scheduled. Testing of source herds of slaughter animals having lesions
of tuberculosis shall be done by state or federal regulatory veterinarians
using the SCT or Stat Pak/DPP.
(A) If the herd of origin is positively identified
and M. bovis has been confirmed by bacterial isolation from the slaughter
animal, all animals responding to the SCT or Stat Pak/DPP shall be
classified as reactors. In all other cases, supplemental diagnostic
tests may be used.
(B) In herds identified as the source of culture negative
lesioned animals, responding animals may be classified as reactors
or suspects. If classified as suspects, they may be retested by supplemental
diagnostic tests.
(j) Cleaning and disinfection of premises, conveyances,
and materials. All premises, including all structures, holding facilities,
conveyances, and materials that are determined by program officials
to constitute a health hazard to humans or animals because of tuberculosis,
shall be properly cleaned and disinfected. This shall be done within
15 days after the removal of tuberculosis-affected or exposed cervids
in accordance with approved procedures. However, these officials may
extend the time limit for disinfection to 30 days when a request for
such extension is received prior to the expiration date of the original
15-day period allowed.
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| Source Note: The provisions of this §43.21 adopted to be effective August 31, 1995, 20 TexReg 5857; amended to be effective July 5, 1996, 21 TexReg 5555; amended to be effective October 1, 1997, 22 TexReg 11346; amended to be effective October 7, 2013, 38 TexReg 6912 |
