Document gDz1kgoGZbL1pvGzGR5EVJdje

e /\ r* Reaction Jit Oulnos Pipi In footed with, Tubcrole Bacilli at the Onoot of Duat Inhalation, Of the group of 40 Ulnt pigs infeotod with at* "' IX teuuttod tubercle bacilli, Rj itralaC^), at the time that exposure to dust was begun, 31 diod or wore sacrificed before the completion of two yoare of duat expoouro aod were reported la the pepor by Gardner end CuiwaingaCl). Seventeen of thoeo diod froa Intercurrent pneumonia. Brief ly, the roaulta wore ea followai 10 reroded aoae evldanoe of sproad of tho tuborcuiouc proeeaa (fig. 0)| is 6 of these It wee confined to the lui(i and In the other 4 the abdominal viscera alio were involved, Ex* tension of the tnfoetlon was first seen after 7 wraths of dust Inhale-- ttooi during tho next 20 Booths more than half of the animals showed on actlvoly spreading tuberculosis and In 3 of than asell oaritios had ds . valopod. Curing the last 8 months no animals exhibited any ovidonco.of i tebivo Infection although in half of thats tho hoaltd fibrous soars of previous spreads wore obvlouo, Tho soars wore sore extensive than is charaotorlstlc of either tuberculosis or asbestosls alone. Tho 9 anInals which wore otlll allre after two yacrs of duat expo- sure were sacrl flood at' intervale during the following year. In 4 of thoa the prinary fo'l of infection were healod with fibrosis end ovon oalolficatlon end there was no evidence of progression (fig* 9). In the other 8 the tuberouloua foci showed evidence of having provlouoly spread locallyj In 4 of thoa, by the time of autopsy, the fool wore healed, with exceo- alfe fibrosis* in tho remaining animal there wae a generalised chronic tuberculous pnr.umoola la one lobe end In the othor lobes there were Iso lated primary tuberoloa, which were still active but had not spread. 4-fc. Steenken, Jr, and O&rdnor, t,Ui R| Strain of Tuberolo Bcolllus, da, Kev, luberc, bit 61, 1940^ T