Studies upon plague in ground squirrels (in four parts) ... : II. A plague-like disease of rodents / by George W. McCoy.

  • McCoy, George W.
Date:
1911
Catalogue details

Licence: Public Domain Mark

Credit: Studies upon plague in ground squirrels (in four parts) ... : II. A plague-like disease of rodents / by George W. McCoy. Source: Wellcome Collection.

    56/98 page 54
    Bd dark, almost black, or slate blue. Whitish or yellowish caseous gran- ules varying in size from a pin’s point to about 1 mm. in diameter, and in number from a dozen to so many as to be uncountable, are found throughout the tissue. They often project slightly above the surface of the organ. PI. VI, fig. 11. Liver.—Granules similar to those found in the spleen are frequently found in the liver, sometimes being more numerous than in the spleen. Quite often they are ashen gray in color. Lungs.—These organs are very rarely involved, but in one case we have observed granules like those found in the liver and in the spleen. Occasionally the tissues are slightly jaundiced. The following table shows the frequency of the various lesions in squirrels naturally infected: Bubo: . ; Present....: . .<a-- -.5- -je neh +9 > Sepailgpeeclign se pa bie = — ela ne 29 M1): 1) rr e tT 3 Single— IOEUING] «dans 2s: + 42 = > +, 2:0 nycesepnmbent tial g ei ie aipye Sor eae 5 Amillary.....-...-..- 0-4. swale ies eee ae esau ee eel 4 CGEVICAL. 2 oe. e eee ee ee ee ok a an 5. Pelvic... o: 0,20 le. a 6 23 Multiple— Inguinal and pelvic............ {pa Sidsels bay «puedes Gee a 4 Gervical and axillary... ......<-.0daneipdee mi leu Ome nee anie ann 1 Cervical and inguinal... ..........2..¢euienem 5's 4s 2s oe ae 1 6 Spleen granules: Present. ....2...-2.2..... 245 sd ee ieee ca a 24 PDSCNE. cece ee ee Se 0d sia be alain OO le ee ne re aia 8 Liver granules: Pregemts 25 0).00- Lecce. oe. 2... vale Sid inne git arotele a) tn ims Absent... ...........0........ 0.0 21 Lung granules: Presents. 0.0002...0/ 0.20.00: DO Sse 1 ADSeMt.)... 0... eee eee ee cae bales Unite aa 20 e4 ola 31 INOCULATED SQUIRRELS. As these animals were examined very soon after death, remarkably clear and distinct lesions were found. The only essential point of dif- ference from the naturally infected squirrels was the presence of a local reaction at the site of inoculation. When the rodent had been infected by the cutaneous method (vaccination), there was a small scab and some thickening at the site, while occasionally a few papules
    digitised image 1
    digitised image 2
    digitised image 3