An investigation on epidemiology of duck collbacillosis was carried out on 224 colibacillosis duck flocks from 1 city and 4 provinces in the Mekong delta. The study results showed that duck colibacillosis was popular in the Mekong delta and caused significant losses in duck production with quite high morbidity (9.09%) and mortality (5.86%) in population, death percentage of diseased ducks was very high up to 64.44%. The disease happened throughout the year, but number of outbreaks was lowest at the end of year (November and December). All duck ages were susceptible to colibacillosis, 1 to 30 day old ducklings were most frequently affected, but the biggest losses were reported in ducks at the ages of 31 to 60 days. Running ducks and ducks for eggs had higher morbidity and mortality than those of ducks for meat and captive reared ducks. Ducks raised in small scales (50-200 birds) or big scale (>5,000 birds) had higher morbidity and mortality than those of ducks raised in medium ones. Prevention methods such as disinfection, vaccination, antibiotic using and deworming showed to be important factors in reducing losses caused by colibacillosis in ducks. Examining the influence of preventive monofactor on duck colibacillosis status, deworming showed to be the most important factor in reducing the severity of colibacillosis status when it happened in ducks with the lowest morbidity and mortality (4.31 and 0.98%). The results also showed that flocks getting combination of disinfection, vaccination and deworming (D-V-Dw) had lowest morbidity and mortality (2.01 and 0.55%). These epidemiological data are useful for planning effective strategy in disease control and prevention.

Keywords: duck, colibacillosis, Mekong delta, morbidity, mortality

An investigation on epidemiology of duck collbacillosis was carried out on 224 colibacillosis duck flocks from 1 city and 4 provinces in the Mekong delta. The study results showed that duck colibacillosis was popular in the Mekong delta and caused significant losses in duck production with quite high morbidity (9.09%) and mortality (5.86%) in population, death percentage of diseased ducks was very high up to 64.44%. The disease happened throughout the year, but number of outbreaks was lowest at the end of year (November and December). All duck ages were susceptible to colibacillosis, 1 to 30 day old ducklings were most frequently affected, but the biggest losses were reported in ducks at the ages of 31 to 60 days. Running ducks and ducks for eggs had higher morbidity and mortality than those of ducks for meat and captive reared ducks. Ducks raised in small scales (50-200 birds) or big scale (>5,000 birds) had higher morbidity and mortality than those of ducks raised in medium ones. Prevention methods such as disinfection, vaccination, antibiotic using and deworming showed to be important factors in reducing losses caused by colibacillosis in ducks. Examining the influence of preventive monofactor on duck colibacillosis status, deworming showed to be the most important factor in reducing the severity of colibacillosis status when it happened in ducks with the lowest morbidity and mortality (4.31 and 0.98%). The results also showed that flocks getting combination of disinfection, vaccination and deworming (D-V-Dw) had lowest morbidity and mortality (2.01 and 0.55%). These epidemiological data are useful for planning effective strategy in disease control and prevention.

Keywords: duck, colibacillosis, Mekong delta, morbidity, mortality