Water bird egg drop syndrome is caused by a combination of viruses, nutrient deficiency factors and certain stress factors. It is an acute, low-fatality infectious disease characterized by a drastic decline in water egg production, especially in ducks. The disease mainly occurs during the laying period of mother ducks or mother gooses and occurs frequently in winter and spring. The clinical symptoms of waterfowl suddenly reduced by 25% to 50%, the egg production rate dropped sharply, some of the sick ducks were weeping (moist feathers wet) or swollen heads. In necropsy, it is sometimes difficult to detect obvious pathological changes; sometimes there are small spot-like or streak-like haemorrhages and white necrotic pseudomembranes in the oral and esophageal mucosa, congestive or localized hemorrhages and ulcers in the intestinal and cloacal mucosa; Visible myocardium gray stripe-like degeneration and necrosis, pancreas with red-brown spots bleeding, degeneration; sometimes visible cellulose, yolk peritonitis and so on. Control methods 1. For the mother duck group, from the young age, the immunization with the water poultry egg production decline syndrome oil emulsion inactivated vaccine should be used for reasonable immunization: the vaccine should be inoculated once every 15 to 20 days, and subcutaneous injection of 0.5 ml/proportion; 1 month before the egg inoculation, intramuscular injection of 1 ~ 1.5 ml / only; after each of the end of spring, early winter (or Mid-Autumn Festival) inoculated once each, 1.5 ~ 2 ml / only. At the same time, it can cooperate with inactivated E. coli inactivated vaccine and duck plague vaccine, and do a good job of routine feeding management and sanitation. 2. For the flock where the disease has already occurred, the following measures can be taken: (1) As soon as possible, the diseased flocks use waterfowl egg drop syndrome hyperimmune serum intramuscularly for immunotherapy, or waterfowl egg drop syndrome oil emulsion inactivated vaccine. For emergency immunization, intramuscular injection of 1 ~ 1.5 ml / only. 2 use some anti-viral drugs, such as viroid, ribavirin, amantadine and other spices, in order to inhibit the infection of related viruses; use some antibiotics to inhibit secondary or co-infection of bacteria. 3 Add some nutrients in the feed, such as methionine, multivitamin additives, etc., and minimize the stress factors in the environment (such as the influence of supercooling and overheating temperature). 2. For the flock where the disease has already occurred, the following measures can be taken: (1) As soon as possible, the diseased flocks use waterfowl egg drop syndrome hyperimmune serum intramuscularly for immunotherapy, or waterfowl egg drop syndrome oil emulsion inactivated vaccine. For emergency immunization, intramuscular injection of 1 ~ 1.5 ml / only. 2 use some anti-viral drugs, such as viroid, ribavirin, amantadine and other spices, in order to inhibit the infection of related viruses; use some antibiotics to inhibit secondary or co-infection of bacteria. 3 Add some nutrients in the feed, such as methionine, multivitamin additives, etc., and minimize the stress factors in the environment (such as the influence of supercooling and overheating temperature). Silicone Manual Resuscitator ,Anesthesia Respirators,Portable Respirator,Mask Respirator Jiangsu Yongle Medical Technology Co., Ltd. , https://www.jsylmedical.com