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Results for “PROTOZOAN INFECTIONS”

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At least 523 records · Page 29Linked to original sources
PubMed1975

Control of Epistylis on channel catfish in raceways.

An Epistylis outbreak occurred on channel catfish in raceways during two growing seasons. Bioassays of potential control chemicals were conducted. Based on the bioassay results, salt (NaC1) plus formalin and salt alone were the most effective treatment chemicals.

Acetates↗
PubMed1978

Mortality of young-of-the-year rainbow smelt (Osmerus mordax) in Lake Erie associated with the occurrence of Glugea hertwigi.

An extensive mortality of young-of-the-year rainbow smelt (Osmerus mordax) occurred in Lake Erie during the fall of 1969. Dead and dying smelt were observed along the north shore from west of Long Point in the central basin to Port Maitland in the eastern basin. No other fish species was involved. Glugea hertwigi, a microsporidan parasite, was observed in 90% of the distressed smelt examined, and is believed to have been a major contributing factor to the mortality.

Animals↗
PubMed1979

Some parasitic and infectious diseases in waterfowl in Oklahoma.

Blood films and serum samples from free-ranging waterfowl wintering in and migrating through Oklahoma were examined for hematozoa and tested for antibody responses to Newcastle disease virus (NDV) and type-A influenza. One-hundred-eleven of 728 birds (15.24%) were positive for 1 or more hematozoa. Serologic testing revealed 11 of 280 (3.93%) positive for antibody to NDV and 5 of 171 (2.95%) positive for antibody to type-A influenza.

Animals↗
PubMed1980

In vivo and in vitro studies on the host specificity of Trypanoplasma salmositica.

The host specificity of Trypanoplasma salmositica was studied by experimental inoculation into 13 species of common teleosts (Notropis cornutus, Notropis heterolepis, Notropis spiloperus, Nocomis biguttatus, Rhinichthys atratulus, Semotilus atromaculatus, Carassius auratus, Ambloplites rupestris, Lepomis gibbosus, Etheostoma nigrum, Hypentelium nigricans, Ictalurus melas, and Eucalia inconstans). T. salmositica was not recovered at 14 and 40 days post inoculation. However, large numbers of the parasite were recovered from Salmo gairdneri and Cottus cognatus, thus indicating that sculpins might be reservoir hosts in certain areas where salmonids and sculpins occur in close proximity. Using a modified In Vitro Plasma Incubation Technique, it was shown that the plasma of refractory fishes had lytic ability and the titer ranged from 1:4 to 1:8. Undiluted fresh plasma of goldfish and of the northern hog sucker lysed about 500 parasites within 30 to 60 mins at 4 C. This lytic ability of fresh plasma was heat labile and partial coagulation of the blood also reduced the lytic titer. This study showed that Trypanoplasma salmositica was more host specific than orginally reported. It was suggested that the mechanism responsible for providing the innate immunity to this parasite in some fishes was the Alternate Pathway of Complement Activation.

Animals↗
PubMed1980

Hematozoa of mallard ducks (Anas platyrhynchos) of the Pacific Flyway, Washington.

Blood smears from 837 mallard ducks (Anas platyrhynchos), collected during January and February from various locales in Washington during the period 1974-1977, were examined for hematozoa. Of these, 339 (40.5%) harbored blood parasites: Leucocytozoon simondi was the most common, occurring in 24.4% of the birds, followed by Haemoproteus nettionis (23.4%). Microfilariae were found in 14 birds (1.7%).

Animals↗
PubMed1981

Effects of low temperature on the development of the microsporidan Glugea stephani in English sole (Parophrys vetulus).

Glugea stephani requires temperatures above 15 C for development in juvenile pleuronectid flatfishes in Yaquina Bay, Oregon. The effect of low temperature (10 C) on the development of recently established parasites was tested experimentally in juvenile English sole (Parophrys vetulus). Low temperature arrested parasite development, but did not kill the protozoan which resumed development on return to 19-20 C after as long as 42 days at 10 C. No parasites detectable with the light microscope were found in fish examined after 70 days at 10 C. Although most juvenile English sole move permanently from the estuary to cooler ocean waters in fall and do not contribute to the continuation of the parasite life cycle, the cycle may be maintained by low numbers of English sole that overwinter in the estuary.

Animals↗
PubMed1984

Myositis and death in bobwhites, Colinus virginianus (L.), due to hemorrhagic cysts of a haemosporozoan of undetermined taxonomic status.

An epizootic of myositis and death in pen-reared bobwhites occurred at a hunting club in California. The myositis was caused by myriads of elongate protozoan cysts. The cysts were in various stages of development and when mature, contained spherical zoites 1 micron in diameter. Sinuous compartments were present in all cysts. The walls of the compartments were composed of a material similar to the cyst walls. Mature cysts were filled with blood. The histologic and ultrastructural morphology of the parasite revealed the parasite to be a haemosporozoan. The parasite has numerous similarities to both Akiba caulleryi (Mathis and Leger, 1909) and organisms that cause aberrant leucocytozoonosis in other species of birds. Further studies are needed to determine if the parasite is a part of the normal parasite fauna of quail or if it represents a parasite in an aberrant host.

Animals↗