116 POULTRY DISEASES 



suited fatally to those persons eating infected 

 meat. 



Postmortem Findings.— Usually on autopsy all 

 organs appear normal so far as gross appearance 

 goes, but extreme emaciation as described above 

 is noted. 



The following is the result of a blood study in 

 these cases : 



Report of Asthen Cases 



Two outbreaks have been investigated by the author. One 

 in a flock of Rhode Island Reds, in which flock there 

 were about two "hundred birds which should have weighed 

 about two pounds each. The disease affected a gradually 

 increasing number. The feed consisted of grain, insects picked 

 up from the fields, and plenty of green grass. As it was 

 irrigation time, the birds had access to the irrigating ditches. • 

 The henhouse and yard were kept • clean. It was advised 

 to change the run and continue giving a variety., of good 

 green feed and grain with a good -supply of water. The 

 disease finally disappeared from the flock. All efforts at the 

 laboratory to isolate any germ which might have been the 

 cause of the disease were unsuccessful. 



The second flock was from eggs that had been produced 

 by birds in which roup had appeared the preceding winter. 

 Five birds about four months old were sent to the laboratory 

 for study with the following history : The birds had good 

 hygienic surroundings, were moved from place to place, given 

 fresh water and good quality of feed, with plenty of green 

 stuff, but without success;' the birds not only did not thrive, 

 but continued to lose flesh and finally died, notwithstanding 

 that most of them had a ravenous appetite. 



Chick No. 3. — Hemoglobin, 65 per cent; erythrocytes, 2,920,- 

 000. Leukocytes, 28,000. Differential -count: Polymorphonu- 

 clear neutrophiles, 39 pei; cent; eosinophiles, 30 per cent; 

 lymphocytes, 29 per cent; mast cells, 2 per cent. 



Chick No. 4. — Hemoglobin, 65 per cent; erythrocytes, 2,600,- 

 000; leukocytes, 14,000. Differential count: Eosinophiles, 

 31 per cent; mononuclears, 8 per cent; lymphocytes, 60 per 

 cent; basophiles, 1 per cent. 



Chick No. 5. — Hemoglobin, 75 per cent; leukocytes, 34,000; 

 erythrocytes, 3,000,000. Differential count: Polymorphonu- 

 clears neutrophiles, 4 per cent; eosinophiles, 50 per cent; baso- 

 philes, 3 per cent; mononuclears, 4 per cent; lymphocytes, 

 39 per cent. 



Chick No. 6. — This bird was about four months old, stunted 

 in growth, "going light," and had contracted roup from an- 

 other bird. The blood study shows the following: Hemo- 



