| leucocytozoonosis in canada geese at the seney national wildlife refuge. | a history is given of the seney national wildlife refuge and the losses of goslings of canada geese (branta canadensis) recorded since inception of the refuge in 1935. since 1960, when more reliable data became available, losses have been estensive every 4 years. goslings deaths are attributed to the infection with leucocytozoon simondi. the blackfly (simulium innocens) is considered to be the prime vector in the transmission of this blood parasite to goslings. | 1975 | 807752 |
| the effect of temperature, age and density of gametocytes, and changes in gas composition on exflagellation of leucocytozoon simondi. | | 1973 | 4197159 |
| the fine structure of leucocytozoon simondi. vi. hepatic schizogony. | | 1973 | 4197160 |
| the fine structure of leucocytozoon simondi. v. the oocyst. | | 1972 | 4624979 |
| experimental studies of the life cycle of leucocytozoon simondi in ducks in norway. | | 1972 | 4627525 |
| anemia in ducks infected with leucocytozoon simondi. | | 1966 | 4961344 |
| schizogony and gametogony of leucocytozoon simondi and associated reactions in the avian host. | | 1967 | 4962567 |
| the cytological development and encapsulation of megaloschizonts of leucocytozoon simondi. | | 1967 | 4964975 |
| observations on the development and significance of leucocytozoon simondi megaloschizonts and a technique for their isolation. | | 1968 | 4970339 |
| freeze-preservation of leucocytozoon simondi sporozoites in liquid nitrogen. | | 1967 | 4973779 |
| the fine structure of leucocytozoon simondi. i. gametocytogenesis. | | 1970 | 4984429 |
| morphological study of microgametogenesis of leucocytozoon simondi. | | 1970 | 4988107 |
| the fine structure of leucocytozoon simondi. ii. megaloschizogony. | | 1970 | 4989088 |
| in vitro cultivation of exoerythrocytic stages of leucocytozoon simondi. | | 1971 | 4999287 |
| elongate and round gametocytes of leucocytozoon simondi (mathis & léger) in ducks inoculated with megaloschizonts. | | 1971 | 5002416 |
| comparison of infections with leucocytozoon simondi in black ducks (anas rubripes), mallards (anas platyrhynchos and white pekins (anas bochas). | | 1968 | 5749476 |
| leucocytozoon simondi infection in european and american eiders. | an adult european eider (somateria mollissima mollissima) died at the st louis zoo and was found to be infected with numerous blood and tissue stages of leucocytozoon simondi. necropsy revealed massive air sac aspergillosis, but histologic examination revealed a diffusely distributed protozoon organism that was identified as l simondi. examination of tissues from a previously necropsied european eider and from 2 american eiders (somateria mollissima dresseri) that later died also revealed eviden ... | 1983 | 6417090 |
| blood parasites of trumpeter swans, olor buccinator (richardson), from alberta. | a total of 75 trumpeter swans (olor buccinator (richardson) from the grande prairie region of alberta was examined for hematozoa; 26 (34.6%) swans were infected with haemoproteus nettionis. a single infection of leucocytozoon simondi and two of plasmodium circumflexum also were recorded. local, second year (sy) and adult (ahy) female swans had closely similar rates of hematozoan infection; the sy and ahy male swans had substantially higher infection rates than other subgroups. | 1981 | 7241706 |
| nematocera (ceratopogonidae, psychodidae, simuliidae and culicidae) and control methods. | the biology, veterinary importance and control of certain nematocera are described and discussed. culicoides spp. (family ceratopogonidae) transmit the arboviruses of bluetongue (bt), african horse sickness (ahs), bovine ephemeral fever (bef) and akabane. some other arboviruses have been isolated from these species, while fowl pox has been transmitted experimentally by culicoides. these insects are vectors of the parasitic protozoans leucocytozoon caulleryi and haemoproteus nettionis, and the pa ... | 1994 | 7711309 |
| haemoproteus greineri in wood ducks from the atlantic flyway. | thin smears of blood were examined from 157 wood ducks (aix sponsa) trapped at savannah national wildlife refuge (south carolina, usa) and harris neck national wildlife refuge (georgia, usa) during spring and summer, 1994 and 1995. thirteen wood ducks (8%) were infected with blood parasites. eleven of these birds were infected with haemoproteus nettionis, seven with leucocytozoon simondi, and five with unidentified microfilariae. additionally, eight wood ducks (5%) were infected with haemoproteu ... | 1997 | 9131576 |
| hematozoa of waterfowl from michigan. | two hundred eighteen and 127 wild waterfowl (anatidae) of five species were sampled from the kellogg biological station area (michigan, usa) during the summer (1 june to 24 august 1995) and fall (9 september to 8 october 1995), respectively. twelve (6%) of those sampled in summer and 13 (11%) sampled in the fall were infected with hemosporids. haemoproteus nettionis, haemoproteus greineri, and leucocytozoon simondi infected both summer and fall birds, with h. nettionis the most common (4% summer ... | 2000 | 11085442 |
| the relapse phenomenon in the leucocytozoon simondi infection of the domestic duck. | | 1952 | 12985563 |
| studies on the histopathology of leucocytozoon simondi infection. | | 1957 | 13394842 |
| natural and experimental transmission of the waterfowl parasite, leucocytozoon simondi m. & l, in wisconsin. | | 1962 | 13861247 |
| an occurrence of leucocytozoon simondi in manitoba. | | 1955 | 14364356 |
| incidence of malaria in a wintering population of canvasbacks (aythya valisineria) on chesapeake bay. | canvasback ducks wintering on chesapeake bay had a 6% incidence of leucocytozoon simondi and 2% incidence of haemoproteus. subinoculation of whole blood into pekin ducklings produced a plasmodium infection rate of 31%. females were more frequently infected (12/22) than males (15/68). the parasite was identified as p. circumflexum. | 1970 | 16512153 |
| relationships between circulating leucocytes and leucocytozoon simondi in mallard, anas platyrhynchos, ducklings. | leucocytozoon simondi is an apicomplexan blood parasite of waterfowl that frequently causes significant mortality, and thus is expected to provoke a significant immune response in hosts. using blood smears collected in consecutive weeks from 30 wild-stock mallard, anas platyrhynchos, ducklings, we tested with repeated measures analyses for associations between leucocyte profiles and l. simondi infection intensities. with each of the five weeks of leucocyte profiles as response variables, we foun ... | 2010 | 20044017 |
| blood parasites of blue-winged teal ( anas discors ) from two migratory corridors, in the southern usa. | we collected 180 blue-winged teal ( anas discors ) in september and october 2002 from florida, us (n=100, representing the eastern migratory corridor) and the louisiana-texas, us, border (n=80, representing the western migratory corridor) and examined for blood parasites using thin heart-blood smears. leucocytozoon simondi, haemoproteus nettionis, and microfilariae were found in 16, 23, and 27 birds, respectively. prevalence of l. simondi and h. nettionis did not vary by migratory corridor, but ... | 2016 | 27285417 |
| reactions against the megaloschizonts of leucocytozoon simondi mathis and leger in ducks. | | 1957 | 13416638 |
| parasitemia in primary leucocytozoon simondi infections. | | 1952 | 13023500 |
| hematozoa of hatch-year common mergansers from michigan. | fifty-five hatch-year common mergansers (mergus merganser) were sampled for hematozoa from douglas lake (michigan, usa) on 17 july 1995. forty-one (75%) were infected with hematozoa. haemoproteus greineri and leucocytozoon simondi were common, infecting 28 (51%) and 26 (47%) common mergansers, respectively. plasmodium circumflexum infected two (4%) birds. the common merganser is a new host record for h. greineri and p. circumflexum. intensity data indicate possible negative interspecific interac ... | 2001 | 11310899 |
| hematozoa of wood ducks (aix sponsa) in missouri. | we examined 371 wood ducks (aix sponsa) for hematozoa from two localities in missouri (usa) in 1989 and 1990. thirty-seven (10%) harbored one or more species of blood parasites. haemoproteus nettionis was the most common parasite, occurring in 36 (10%) of the birds. leucocytozoon simondi was found in two (0.5%) and microfilaria occurred in five (1%) of the wood ducks examined. infections were more prevalent in adults (18%) than in immature birds (2%). there was no difference in prevalence betwee ... | 1994 | 8151821 |
| blood parasites of prairie anatids and their implication in waterfowl management in alberta and saskatchewan. | information on the blood parasites occurring in 3,866 anatids of 14 species collected from five locations in alberta and saskatchewan during 1976-80 is summarized. an overall prevalence of 26% with avian hematozoa was recorded. leucocytozoon simondi was the most frequently encountered parasite, occurring in 17% of the ducks; haemoproteus nettionis was observed in 11% of the birds while plasmodium circumflexum and microfilariae (probably of splendidofilaria fallisensis) occurred in only 2% and le ... | 1982 | 6813511 |
| 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%). | 1980 | 6780700 |
| hematozoa of wood ducks (aix spons) in the atlantic flyway. | a total of 213 wood ducks (aix sponsa) from 24 localities in 12 states in the atlantic flyway was examined for blood parasites in 1976 and 1977. hematozoa were present in birds from every collection site from virginia northward to maine. only one infection was detected in birds from north carolina southward to florida. haemoproteus nettionis was the most common parasite, occurring in 56% of the northern wood ducks; leucocytozoon simondi (20%), plasmodium circumflexum (6%), and microfilariae (18% ... | 1980 | 6774111 |
| blood parasitemia in a south texas wintering waterfowl population. | eleven species of wintering waterfowl were trapped on the welder wildlife foundation, san patricio county, texas, between october, 1976 and may, 1977. blood films were made from 580 ducks. leucocytozoon simondi, haemoproteus nettionis, plasmodium circumflexum, and a microfilaria were found in three species. these blood parasites occurred in 70 lesser scaups (aythya affinis), 12 blue-winged teals (anas discors), and 3 ring-necked ducks (aythya collaris). there was no difference in the rates of i ... | 1980 | 6768901 |
| relapses in ducks chronically infected with leucocytozoon simondi and parahaemoproteus nettionis. | | 1968 | 5650825 |
| crystalline inclusions in leucocytozoon simondi. | | 1971 | 5543173 |
| prepatent period and parasitemia in leucocytozoon simondi infections resulting from short exposures tosporozoites. | | 1966 | 4959031 |
| diurnal periodicity in peripheral parasitemias in ducklings (anas boschas) infected with leucocytozoon simondi mathis and leger. | | 1973 | 4633118 |
| blood parasites of some birds from northeastern mexico. | a total of 196 birds of 31 species from 15 families from northeastern mexico was examined for blood parasites; 25 birds (12.8%) of 11 species harbored 1 or more species of hematozoans. species of haemoproteus accounted for half of the total infections encountered. leucocytozoon simondi was found in 2 mexico ducks (anas diazi) and this represents the first record of the transmission of this parasite in mexico. the results of this survey were compared with those obtained nearly 50 yr ago from a su ... | 1991 | 1992093 |
| [a disease of ducklings caused by leucocytozoon simondi with special references to histopathological diagnosis]. | | 1977 | 930483 |
| further laboratory studies on the rearing and feeding of cnephia ornithophilia (diptera: simuliidae) and the transmission of leucocytozoon simondi by this black fly. | | 1976 | 827614 |
| nuclear changes preceding microgamete formation in leucocytozoon simondi and leucocytazoon tawaki. | | 1976 | 820416 |
| the development and pathogenesis of leucocytozoon simondi in canada and domestic geese in algonquin park, ontario. | | 1976 | 820415 |
| leucocytozoonosis in canada geese in upper michigan,. 1. strain differences among geese from different localities. | geographic variation in pathogenicity of leucocytozoon simondi in canada geese (branta canadensis maxima) was investigated by exposing goslings to natural infection at three locations in the upper peninsula of michigan. examination of blood smears and tissue sections revealed two patterns of development. hepatic schizogony and secondary megaloschizogony occurred in cells of the reticuloendothelial system, with round and elongate gametocytes, or only hepatic schizonts and round gametocytes. the e ... | 1978 | 416231 |
| anemia in leucocytozoon simondi infections. i. quantification of anemia, gametocytemia, and osmotic fragility of erythrocytes in naturally infected pekin ducklings. | | 1977 | 402177 |
| the polar ring complex in ookinetes of leucocytozoon simondi (apicomplexa: haemosporina) and evidence for a conoid in haemosporidian ookinetes. | ookinetes of leucocytozoon simondi have a polar ring complex (prc) which is composed of a stout electron-lucent polar ring with about 34 posteriorly extending tines. the latter are subtended by about 76 subpellicular microtubules. a broad collar of electron-dense material is associated with the cytoplasmic surface of the inner double membrane complex of the pellicle. additional particulate material of varying density occupies the space between tines and the dense material associated with the pel ... | 2011 | 23195660 |
| the epizootiology of leucocytozoon simondi infections in domestic ducks in northern michigan. | | 1952 | 14933389 |