Porcine streptococcal disease is a general term for a variety of diseases caused by several serogroups of streptococcal infections. Acute is often hemorrhagic sepsis and encephalitis; chronic is characterized by arthritis and endocarditis. The disease has occurred in many areas of China, and sometimes it is even an explosive epidemic. The Ningbo area also exists, causing certain losses to the pig industry.
1. Pathogens.
Streptococcus bacteria, the bacteria that cause disease in pigs are characterized by beta hemolysis (individual hemolysis), which is arranged in a chain and is Gram-positive. The main pathogenicity to animals is B, C, and E. The bacteria have strong resistance to the external environment and survive on the site of 29-33 ° C for 6 days, which is sensitive to general disinfectants. The disease belongs to facultative anaerobic bacteria and is widely distributed. Water, soil, air, dust and animals are found in the intestines, feces, respiratory tracts and genitourinary tracts of humans.
2. Popular characteristics.
The incidence of piglets, shelf pigs and pregnant sows is high in the herd. It is usually transmitted through the digestive tract, respiratory tract and various surgical wound wound infections. There is no obvious seasonality in the onset. Sick and infected pigs are important sources of infection for this disease. The contact of the Miao pig collection market, the pollution of packaging and transportation vehicles, etc., often cause the spread of this disease. Dead pork, viscera and waste that have not been harmlessly treated are the main causes of this disease.
3. Clinical symptoms.
The incubation period of this disease is 1 to 5 days or slightly longer. According to clinical symptoms:
1 acute septic type. Sudden deaths often occur in the most acute cases. Slow body temperature up to 41 ~ 43 ° C, eye conjunctiva flushing, loss of appetite, tears, serous nasal fluid, difficulty breathing, abdominal, limbs, ear tips have hemorrhagic purpura, limp. Often died within 2 to 4 days.
2 meningitis type. More common in piglets, increased body temperature, reduced food, molars, movement disorders, circling movements, limbs swimming or coma. Some of the sick pigs developed polyarthritis, joint swelling and suppuration. The course of disease is 1 to 2 days.
3 suppurative lymphadenitis type. Most of them suffer from submandibular lymph nodes, pharyngeal and cervical lymph nodes purulent, swollen lymph nodes, and hot pain, affecting feeding, chewing, swallowing and even breathing disorders. The course of disease is 3 to 5 weeks, and generally does not cause death. 4 arthritis type. It is characterized by swelling or pain in one or several limbs, and there are symptoms of lameness. The course of disease is 2 to 3 weeks.
4. Pathological changes.
Acute septic type. Hemorrhagic sepsis lesions and serositis are predominant. Meningitis type. Meningeal congestion, bleeding, and even bleeding.
5. Diagnostic points.
It is mainly diagnosed according to epidemiological characteristics, clinical symptoms and characteristics, pathological anatomy and laboratory examination.
6. Control measures.
1 To strengthen the management of the breeding, the pig farms are kept clean and hygienic. Once a pig has a trauma, it must be disposed of in a timely manner.
2 Vaccination measures can be taken. Streptococcus suis vaccine is used, and each pig is injected with inactivated vaccine (3 to 5 ml) and attenuated vaccine 1 ml, and the immunization period is 4 to 6 months.
3 Antibiotics (such as sulfonamides) can also be mixed into the feed to feed the pigs, which can achieve certain preventive effects.
4 The sick pigs were kept in isolation and treated with streptomycin, erythromycin, kanamycin, penicillin and sulfonamides. The dead pigs and pollutants should be treated harmlessly and the site should be thoroughly disinfected.
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Comprehensive Function Features
Direct-To-Floor
By the principles of distance, automatically generate the smooth curves from start of parking, no crawling and directly stop in the levelling position.
Optimum Velocity Profile Efficiency
The elevator controller will optimise the velocity profile based on the desired travel distance demand instead of floor number.
Advanced Door-Opening
Under the automatic operation state, the speed during stopping is less than 0.1 m/s and the gate signals effective, system shorts door-lock signal through advanced door-opening module and then opens the door ahead of time to enhance the elevator efficiency
Category Door Open Holding Set-Time
System can automatically identify different time to keep the open calls to open the door, instructions to open the door, the door to protect open, delay to open the door and to open the door inaccordance with the setting time.
Re-levelling
This may occur when the lift stops at the floor station, and a large number of persons or goods enter or leaves. The levelling fluctuates because of the elastic deformation of elevator Wire Rope and the rubber. System is allowed to run automatically at the relevelling speed to the levelling station with the door open.
Self-Rescue Levelling
The elevator is in its normal operating state, but doesn`t stop at the correct level. If it meets the safety requirements to run, the lift will automatically run slowly to the nearest floor area, and then open the door.
Emergency Inertia Rescue Mode
Applicable for permanent-magnet synchronous motors only. When there is a power failure, system will short-circuit the motor phases through its contactor and produce a restraining torque when in motion. Based on the elevator inertia, the elevator will slide slowly and controller will open the elevator door when it reaches levelling position.
Emergency Self-Rescue Time-Out Protection
When elevator is at balance load or rescue device power capacity is inadequate. Long rescue time lapse is expected and accident may occur. This function enables the system to self-disable the emergency operation.
Elevator Position Auto Calibration
Each time the elevator enters the terminal floor zone, system will self-calibrate the position counter with respect to the 1st slowdown limit switch so that elevator over travel operation will be eliminated.
Fire Alarm Rescue Function
Enable user to preset the elevator designated homing floor when fireman mode is enabled
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