Slide Collection (Veterinary Tropical Diseases)

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Now showing 1 - 20 of 25

Congenital babesiosis
(2013-11-05) University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology; koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
Bovine babesiosis or rewater is a tick-borne disease caused by parasites of the genus Babesia which occur in the erythrocytes of infected cattle. There are four Babesia species that are known to occur in cattle in Southern Africa. These are Babesia bovis, Babesia bigemina, Babesia occultans and an unnamed species. In animals which have died from acute B. bovis infections there is severe congestion of most organs with serosal petechiae and ecchymoses occuring in many organs. Note paticularly in this slide the icterus, splenomegaly, degenerated liver and reddened kidneys as a result of haemoglobin.
Brain smear of a bovine that died from cerebral babesiosis
(2013-11-05) University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; koos.coetzer@up.ac.za
Cerebral redwater is diagnosed at necropsy by the examination of strained brain smears. The majority of erythrocytes are parasitized by Babesia bovis. In the cerebral form of the disease the grey matter of the cerebrum and cerebellum is a reddish pink colour due to severe congestion. .
Splenomegaly in a bovine that died from babesiosis
(2013-11-05) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
Bovine babesiosis or redwater is a tick-borne disease caused by parasites of the genus Babesia which occur in the erythrocytes of infected cattle. In animals which have died from acute B. Bovis infections there is severe congestion of most organs with serosal petechiae and ecchymoses occuring in many organs. Splenomegaly and hepatomegaly occur. The liver is yellowish brown.
Meningeal haemorrhage in a case of cerebral theileriosis
(2013-05-29) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology
Turning sickness or cerebral theileriosis is an uncommon aberrant form of infection by Theileria parva or Theileria taurotragi in which lymphoblasts parasitized by schizonts accumulate in cerebral vessels leading to thrombosis and infarction. In the more acute form areas of intense congestion and haemorrhage are present in the meninges and brain which are associated with ares of softening (Infarction) and discoloration of brain tissue. Thrombosed meningeal vessels are often very promiment. There may be severe haemorrhage into the ventricles.
Thrombosis and encephalomalacia in a case of turning sickness
(2013-05-29) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology
Turning sickness or cerebral theileriosis is an uncommon aberrant form of infection by Theileria parva or Theileria taurotragi in which lymphoblasts parasitized by schizonts accumulate in cerebral vessels leading to thrombosis and infarction. In the more acute form areas of intense congestion and haemorrhage are present in the meninges and brain which are associated with areas of softening (Infarction) and discoloration of brain tissue. Thrombosed meningeal vessels are often very promiment. There may be severe haemorrhage into the ventricles. Histological examination shows the obstruction of arteries and arterioles by large numbers of parasitized lymphoblasts associated with haemorrhage and encephalomalacia. Similar lesions may occur in the spinal cord and infarcts may be present in the spleen.
Thrombosed blood vessels (microscopic section) in turning sickness
(2013-05-29) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology
Turning sickness or cerebral theileriosis is an uncommon aberrant form of infection by Theileria parva or Theileria taurotragi in which lymphoblasts parasitized by schizonts accumulate in cerebral vessels leading to thrombosis and infarction. In the more acute form areas of intense congestion and haemorrhage are present in the meninges and brain which are associated with ares of softening (Infarction) and discoloration of brain tissue. Thrombosed meningeal vessels are often very promiment.
Infarcts in the spleen and brain in a case of turning sickness
(2013-05-29) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology
Turning sickness or cerebral theileriosis is an uncommon aberrant form of infection by Theileria parva or Theileria taurotragi in which lymphoblasts parasitized by schizonts accumulate in cerebral vessels leading to thrombosis and infarction. In the more acute form areas of intense congestion and haemorrhage are present in the meninges and brain which are associated with areas of softening (Infarction) and discoloration of brain tissue. Thrombosed meningeal vessels are often very promiment. There may be severe haemorrhage into the ventricles. Histological examination shows the obstruction of arteries and arterioles by large numbers of parasitized lymphoblasts associated with haemorrhage and encephalomalacia. Similar lesions may occur in the spinal cord and infarcts may be present in the spleen.
Turning sickness : infarcts in thalamus and cerebrum
(2013-05-29) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology
Turning sickness or cerebral theileriosis is an uncommon aberrant form of infection by Theileria parva or Theileria taurotragi in which lymphoblasts parasitized by schizonts accumulate in cerebral vessels leading to thrombosis and infarction. In the more acute form areas of intense congestion and haemorrhage are present in the meninges and brain which are associated with ares of softening (Infarction) and discoloration of brain tissue. Thrombosed meningeal vessels are often very promiment. There may be severe haemorrhage into the ventricles.
Thrombosed blood vessel in meninges of a case of turning sickness
(2013-05-29) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology
Turning sickness or cerebral theileriosis is an uncommon aberrant form of infection by Theileria parva or Theileria taurotragi in which lymphoblasts parasitized by schizonts accumulate in cerebral vessels leading to thrombosis and infarction. Turning sickness occurs sporadically and usually in cattle younger than 3 years old. The thrombosed meningeal blood vessel is easily seen on this slides.
Small intestine of a sheep showing numerous white nodules or foci of coccidial parasites
(2009-09-30T08:50:36Z) Unknown; koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
The small intestines are unopened. The numerous white foci, 1-2 mm in diameter each comprise an area in the mucosa where there is a severe infection of epithelial cells. The reddened, hyperaemic intestinal wall indicates that an acute inflammatory process is also present.
Coccidial oocycts in sheep faeces
(2009-09-30T08:48:31Z) University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology; koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
Microscopic appearance of coccidial oocysts in sheep faeces. Numerous round oocysts are present. The slide was prepared by the flotation technique of infected sheep faeces.
Histopathological appearance of various stages of the life cycle of an Eimeria sp. in epithelial cells of the small intestine of a sheep
(2009-09-30T08:46:35Z) Unknown; koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
Severe infection of Eimeria sp. in the epithelial cells of the mucosa. It is a histological section of one of the white nodules seen macroscopically in some cases of coccidiosis in sheep.
Eimeria stiedae in a rabbit liver
(2009-09-30T08:44:50Z) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; Penzhorn, Barend Louis
The liver is the seat of infection with the Eimeria stiedae parasite in rabbits. The photo show numerous white nodules in a rabbit liver. Each nodule comprises thousands of the various developmental stages of the organism.
Cooperia sp. worm egg and a coccidia oocyst in the faeces of a sheep
(2009-09-30T08:44:01Z) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases; Penzhorn, Barend Louis
The worm egg measures about 80-85 by 40-45 in size so that one can obtain an idea of the relative sizes of the two for diagnostic purposes. The preparation is made by the flotation technique of sheep faeces.
Various stages of the life cycle of an Eimeria sp. in intestinal epithelial cells
(2009-09-30T08:42:18Z) Unknown; koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
Species of the genus Eimeria are the most important causes of an important protozoal diseases known as coccidiosis which occurs in many livestock species like cattle, sheep, goats, horses, other mammals and poultry. In livestock the frank disease is characterized by enteritis and diarrhoea following invasion of mucosal cells of the gastrointestinal tract by the parasite. Subclinical infections are common. The developemntal cycle of the parasite in the host occurs intracellularly, while the final form, known as an oocyst is, in domestic animals, passed out to the external environment in the faeces. Oocysts of the genus Eimeria develop into four sporocysts at sporulation, each of them containing 2 sporozoites. If susceptible domestic animals ingest sporulated oocysts, the sporozoites are released through the action of digestive juices and then, depending on the parasite species, enter epithelial or other cells of the mucosa of the gut where they undergo asexual and sexual stages of their life cycle. (Source: Coetzer, JAW & Tustin, RC. 2004. Infectious diseases of livestock. Cape Town, South Africa : Oxford University Press.)
Chronic coccidial lesions in the mucosa of the small intestine of a goat
(2009-09-30T08:40:30Z) University of Pretoria. Faculty of Veterinary Science. Dept. of Paraclinical Sciences. Section of Pathology; koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
The photo shows a severe infection of the small intestine of a goat. Each of the white foci contains numerous Eimeria parasites in various stages of the developmental cycle.
Lung oedema in a bovine lung
(2009-07-02T09:20:15Z) Unknown; koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
This lesion is present to some degree in all cases of heartwater.
Petechiation of the conjunctiva in a case of heartwater
(2008-11-14T08:26:22Z) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
The lesion, petechiation of the conjunctiva, is present in some cases of heartwater
Hydrothorax in a case of heartwater
(2008-09-05T08:47:06Z) koos.coetzer@up.ac.za; University of Pretoria. Faculty of Veterinary Science. Dept. of Veterinary Tropical Diseases
After being bitten by an infected tick E. ruminantium enters the animal in the saliva of the tick. Initial multiplication of the parasiteprobably takes place in cells of the lymph node regional to the tick bite from where it enters the blood stream and invades endothelial cells in various tissues and organs. Increased vascular permeability resuylts in transudation of fluid into various body tissues (e.g. brain and lungs) and body cavities (e.g. pericardial and thoracic cavities), but the precise mechanisms responsible for the transudation are poorly understood. Pathology: the lesions in cattle, sheep and goats are similar, the most pronounced being often severe hydropericardium, hydrothorax and lung oedema with serofibrinous foam being present in the bronchi and trachea. These images illustrated a severe case. (Source: Allsopp, BA, Bezuidenhout, JD & Prozesky, L 2004, 'Heartwater', in Coetzer, JAW & Tustin, RC, Infectious diseases of livestock, Cape Town, Oxford University Press, 2004)
Three stages in the life cycle of the tick Amblyomma hebraeum : male and female adults, a nymph and three larvae
(2008-05-27T06:53:53Z) University of Pretoria. Faculty of Veterinary Science
Amblyomma hebraeum is one of the tick vectors of heartwater which is an acute disease of cattle, goats, sheep and some wild ruminants caused by the rickettsia, Ehrlichia ruminantium (formely Cowdria ruminantium). Heartwater is one of the mayor diseases of livestock in sub-saharan Africa. (Source: Allsopp, BA, Bezuidenhout, JD & Prozesky, L,'Heartwater', Infectious Diseases of Livestock'/ edited by JAW Coetzer & RC Tustin, Cape Town : Oxford University Press, 2004.)

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