Osler = name of a veterinarian scientist. Latin: rostratus = provided with a pointed end.
Worldwide among felids, canids, and in other carnivores, especially common in rearing facilities.
The species O. rostratus (in felids) and O. osleri (in canids) live in nodules within the mucous layer of the bronchia and of the trachea. The males reach a length of 6 mm, while the females may have the double size. The females deposit their larva 1 containing eggs in the breathing system of their hosts. The larva 1 reaches within the mucus the mouth of their hosts, from where they enter the esophagus or may be transmitted by licking other hosts (e.g., females transmit them to puppies).
Symptoms of Disease
The nodules in trachea and in the bronchioles reach diameters of about 1 cm and thus pose problems during breathing and introduce symptoms like coughing, which may reach a chronic phase.
Microscopical determination of the 350 μm long larvae 1, which can be isolated from the feces by help of the Baerman technique.
Oral uptake of larvae 1 from saliva or feces of infected cats, dogs, or their wild relatives.
Very difficult in free roaming animals (due to possible ingestion of vomited material or licking at infected animals).
Long lasting to repeated self-infections.
Ivermectin (0.2–0.4 mg/kg bodyweight subcutaneously) and also moxidectin showed high efficacy, while fenbendazole and oxfendazol needed applications for several weeks in order to reduce the size of the nodules in the trachea.