Clinical Parasitology Images: Gallery II (Click on images for an enlarged view)

Trypanosoma spp

Trypomastigote: a typical trypanosomal trypomastigote similar to those that may occur in dogs, cattle and other domestic animals.

Related images:

• [Trypomastigote]
• [Trypomastigote]

Leishmania spp

Related images:

• Leishmanial promastigotes
• Dog with leishmaniasis

Macrophage with amastigotes in a lymph node impression smear. This specimen iss from a naturally infected dog from central Oklahoma. Several kennel mates were also found to be infected over a several year period (1978-85). These infections were the first reports of endemiclly acquired leishmaniasis in dogs in the United States.

Leishmanial skin lesion

No human cases have been reported in Oklahoma but cutaneous disease is endemic in Texas. Leishmaniasis is a major public health concern. When it is encountered in dogs or any other animal it should be reported to the local State Health Department.

Entamoeba histolytica trophozoite

This is a human parasite that can infect dogs.

Entamoeba coli cyst with eight nuclei

The cyst is the transmission stage of this parasite. This organism is not pathogenic. Similar cysts with differing numbers of nuclei may be found in cattle, horses and pigs.

Toxoplasma gondii tachyzoites in a macrophages

This stage or form of the parasite occurs during the acute stage of the disease. This slide is a lung impression smear from a dog that died from respiratory problems. Later the parasites will form protective cyst stages in tissues with the majority localizing in neurologic tissues.

Balantidium coli trophozoite (macronucleus visible)

Ciliate contributing to neonatal diarrhea in pigs. Also a parasite of humans, dogs and other animals in which intestinal lesions similar to amebiasis may occur. The cytostome, macronucleus, micronucleus, cilia and other structures are visible.

Balantidium coli trophozoite

Common in pigs. Most diagnoses are made by finding motile organisms in a thin saline smear of feces.

Ichthyophthirius multifiliis (fish parasite)

Cause of "ick" in fish. Large macronuclei of trophozoites visible in this histopath section of fish tissues.

Ichthyophthirius multifiliis (histopath of gill)

Cause of "ick" in fish. Large macronucleus can be seen in histopath sections of fish tissues.