52 ‘Farmers’ Bulletin 1150. 
Appearance.—Hair lungworms (figs. 33 and 34) are much smaller 
than the thread lungworms. The body has a characteristic brownish- 
red color, due to the color of the intestine. The male is 1.8 to 2.8 
cm. (about two-thirds inch to a little more than 1 inch) long and ter- 
minates at the tail in a corneus arc, followed by the small bursa (fig. 
33). The female is 2.5 to 
we fl 3.5 cm. (1 to 1.4 inches) 
ni long, with a moderately 
pointed tail. 
Life history.—The life 
history of the hair lung- 
worm has not yet been 
worked out, but it is prob- 
ably similar to that of the 
thread lungworm. 
Distribution—The par- 
asite is widely distributed 
and has been found to be 
fairly common in_ the 
United States. It is per- 
haps less common than the 
previous species or is pos- 
Fic. 33.—Hair lung- sibly found less often be- 
an Seen cause it is smaller. 
Tail of male, viewed Symptoms and lesions.— 
hailtet 1992) "_~‘These worms occasion va- 
rious forms of verminous 
pneumonia. The adult worms cause a lobular 
pneumonia; the eggs and larve cause a diffuse 
pneumonia, or when aggregated in the pneu- OT aii 
monic areas may cause a pneumonia with areas — cens). Tail of female, 
: viewed from side. 
resembling tubercles. These areas show aS (prom Curtice, 1890.) 
grayish-yellow tumors, which may attain a 
diameter ranging from a few millimeters to 2 centimeters (four- 
fifths of an inch). Careful post-mortem examination of these 
pheumonic areas will disclose the reddish worms, and the eggs and 
embryos may be found by microscopic examination of such tissue. 
The weakened tissues afford lodging for disease-producing bacteria, 
sometimes leading to pus formation, in which case the evil effects are 
considerably increased. Sheep will survive an infection with worms 
which prevents only a small amount of lung tissue from functioning, 
but heavy infections reduce the amount of living tissue available for . 
breathing to an extent that often proves fatal, and bacterial complica- 
tions add to this and to the toxic material which is absorbed to the 
injury of the animal. 
