Page 325 - Small Animal Internal Medicine, 6th Edition

CHAPTER 20 Diagnostic Tests for the Lower Respiratory Tract 297

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A B

C D

FIG 20.12
(A) Larva of Aelurostrongylus abstrusus. (B) Larva of Crenosoma vulpis. (C) Double
operculated ova of Capillaria sp. (D) Single operculated ova of Paragonimus kellicotti.

TABLE 20.1

Characteristics of Eggs or Larvae From Respiratory Parasites
PARASITE HOST STAGE SOURCE DESCRIPTION

Capillaria Dog and Eggs Routine flotation of feces, Barrel-shaped, yellow, with prominent, transparent,
aerophila cat airway specimens asymmetric bipolar plugs; slightly smaller than
Trichuris eggs; 60-80 µm × 30-40 µm
Paragonimus Dog and Eggs High-density flotation or Oval, golden-brown, single, operculated;
kellicotti cat sedimentation of feces, operculum flat with prominent shoulders;
airway specimens 75-118 µm × 42-67 µm
Aelurostrongylus Cat Larvae Baermann technique of Larvae with S-shaped tail; dorsal spine present;
abstrusus feces, airway specimens 350-400 µm × 17 µm; eggs or larvated eggs
may be seen in airway specimens
Oslerus osleri Dog Larvae, Tracheal wash, bronchial Larvae have S-shaped tail without dorsal spine;
eggs brushing of nodules, rarely found eggs are thin-walled, colorless, and
zinc-sulfate flotation of larvated; 80 µm × 50 µm
feces
Crenosoma Dog Larvae Baermann technique of Larvae have tapered tail without severe kinks or
vulpis feces, airway specimens spines; 250-300 µm; larvated eggs may be
seen in airway specimens