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avian paramyxoviruses from migrating and resident ducks in coastal louisiana.cloacal and tracheal swabs were collected from 1,409 hunter-killed ducks in cameron parish, louisiana, during the 1986 and 1987 waterfowl seasons. thirty avian paramyxoviruses (pmv's) were isolated from 605 blue-winged teal (anas discors), 75 mottled ducks (a. fulvigula), 375 gadwalls (a. strepera), 334 green-winged teal (a. crecca), and 20 mallards (a. platyrhynchos). prevalence of pmv decreased (p = 0.042) from september (4%) through november (2%) to december and january (1%). juveniles had a ...19912023311
effects of ph, temperature, and salinity on persistence of avian influenza viruses in water.the combined effects of water temperature, salinity, and ph on persistence of avian influenza virus (aiv) were evaluated in a model distilled-water system using three isolates from ducks sampled in cameron parish, louisiana. variables were tested within the ranges normally associated with surface water. differences were detected between temperature (17 c and 28 c), ph (6.2, 7.2, 8.2), and salinity (0 ppt and 20 ppt), with a strong interactive effect observed between ph and salinity. estimated pe ...19902142421
avian influenza viruses from migratory and resident ducks of coastal louisiana.cloacal and tracheal swabs were collected from 1389 hunter-killed ducks in cameron parish, louisiana, during the 1986 and 1987 waterfowl seasons. twenty-eight avian influenza viruses (aivs) were isolated from 605 blue-winged teal (anas discors), 75 mottled ducks (a. fulvigula), 375 gadwalls (a. stepera) and 334 green-winged teal (a. crecca). prevalence estimates of aiv in ducks sampled during september, november, and december through january were 3.1%, 2.0%, and 0.4%, respectively. differences i ...19902369380
the frequency of sarcocystis spp. and its effect on winter carcass composition of mottled ducks.macrocysts of the protozoan parasite sarcocystis spp. occurred in 34 of 241 (14%) adult and 6 of 70 (8.6%) immature mottled ducks (anas fulvigula) that were collected in southwestern louisiana from 1987 to 1989. the prevalence of sarcocystis spp. among immature ducks was higher than previously reported, possibly because of a longer exposure period. no differences in carcass composition variables were found between heavily infected and uninfected adult mottled ducks during the winter period of th ...19911920672
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