China - The basics of bird flu identification in poultry and poultry vaccination strategies

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The basics of bird flu

Avian Influenza (A1) is a type A virus caused by an acute highly contagious disease. The disease can occur throughout the year, regardless of breed, age, particularly multiple cold season. Birds, humans and lower mammals are susceptible to influenza virus type A. Chickens infected with bird flu symptoms was diversity, can be divided into respiratory-type, neuronal and reproductive type. Chickens body temperature, mental gloomy; cough, rales, tears, swelling of the face and head, comb, meat beard, skin and flake purple toes; pull yellow, white Xifen, egg drop, abnormal eggs, soft-shell eggs and egg discoloration increased; individual accompanied by neurological symptoms.

Necropsy
Head edema and wattle, comb, leg cyanosis, congestive; tracheal mucosal edema, congestion, there are serous or cheese-like discharge; sinuses swelling, balloon swelling, thickening and a cellulose or cheese-like exudate; liver, spleen enlargement, necrosis; proventriculus nipple ulcers, bleeding, extensive intestinal bleeding; follicle swelling, redness, tubal congestion, sometimes accompanied by yolk peritonitis.

Preventive measures
The disease is no effective chemotherapy for treatment, the sand can be used to prevent virus infection star drugs. Usually should be based on prevention, oil emulsion vaccine in the affected areas to immunize. Treatment of the disease in chickens to be eliminated.


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Re: China - The basics of bird flu identification in poultry

Re: China - The basics of bird flu identification in poultry

How to develop layers of avian influenza vaccination program


Layers of avian influenza vaccination program:


No maternal antibodies or maternal antibody (1 day old ND and AI maternal antibodies ≤ 1:32 chicks): 7 days: subcutaneous injection H9 avian influenza (vaccine can choose: new flow or a new H9 Duplex tributary of the triple oil seepage); 15 days: Avian influenza H5N1-4-5 subcutaneous injection (this must be a single bird flu vaccine: the kind of free country, or vaccine manufacturers specifically for the kind of)
Maternal antibodies> 1:32 chicks: 15 days: subcutaneous injection H9 avian influenza (the vaccine can choose: a new stream of new branches or H9 triple bivalent oil seepage); 20 days: Avian influenza H5N1-4 -5 subcutaneous injection (this must be a single bird flu vaccine: the kind of free country, or vaccine manufacturers specifically for the kind of)
The Immune: immune effects of avian flu antibodies in order to achieve the ideal, require multiple vaccinations. Science shows that bird flu vaccine takes at least 3 times the oil to generate antibodies relative to the ideal value, the immunity is the basis of the vaccine immunity, or that is: the immune started (the immune high for the next generation of antibody immune re- to do a foundation), this immunization to the vaccine, produced some chicken, some chicken, or weakened immune systems can not detect antibodies. You can use this period to promote immunity to some of the drugs or vitamins and have good environmental management. The immunization dose is not easy too large, not more than 0.3ml.


43 days: subcutaneous injection H9 avian influenza (the vaccine can choose: a new flow or H9 bivalent vaccine alone, try not to use the new tributary of the triple: the basis of this vaccine adapted to the immunity period)


50 days: Avian influenza H5N1-4-5 (must use the national free or vaccine manufacturers specifically for that kind)
The immunity principle is: As the foundation within 20 days, the immune (immune startup), according to Avian Influenza Vaccine theory, the same antigen in oil seepage can be vaccinated 3-4 weeks apart to further activate the immune system so as to achieve high antibody production, due to oil seepage takes 14 days to produce antibodies to 21 days to achieve a strong immune system, increase resistance to the avian influenza virus. That is after the bird flu immunization is about 70 days old, chickens against H5 avian influenza H9 and increased resistance to the relative safety factor, reduced susceptibility to avian influenza (bird flu epidemic season in about 70 days old chickens the proportion of bird flu is still high in some areas, so the two bird flu-free vaccination within 50 days of age is very important, and would like to draw everyone's attention.)


102 days old: Avian influenza H9 subcutaneous injection or intramuscular injection. Vaccine can choose a new stream or H9 single bivalent vaccine, immunization is recommended dose: 0.8 ml.


110 days old: Avian influenza H5N1-5-4, vaccines must select a country or a free supply of vaccine manufacturers specifically for the kind of immune recommended dose: 0.8 ml.
The immunity principle is: the immunization, antibody production can be achieved very good point, antibody levels to reach a desired maximum value, after re-immunization, but to strengthen the immune, that is to maintain the security value of the antibody work. The postemergence Avian Influenza immunization, the immune system has been fully activated, peak egg laying chickens at the dawn of time, to reduce the susceptibility of the avian influenza virus, enhance the safety factor for the safety of ready access to egg laying (about 140 days to detect antibodies to avian influenza has been a very good).


Some chickens at 140 days after the enhanced susceptibility of avian influenza, more than three times the main reason is that the avian flu immunization program arrangements unreasonable, or about 140 days after the bird flu antibody production is not ideal, resulting in the the susceptibility of avian influenza in chickens enhanced safety factor decreased.


160 days old: Avian influenza H5N1-4-5, recommended dose of 0.8 ml, 1 ml types of farms.
The immunity principle is: Avian influenza H5N1-4-5 antibodies decline in the epidemic season generally occurs 60 days after the lower part of the chicken antibody (detection antibody can be seen), so many professionals would recommend 60 days after H5 avian influenza on the destructive conduct a strengthened immunity, about 170 days after immunization of the vaccine on chickens in egg production peak of about 200 days of no effect, more than 60 days near the peak of egg production (95% or more egg production rate) are well protected (bird flu), arrange the peak period of laying the proper immunization of avian influenza is a very important day, we should arrange the meeting to strengthen the immune process arrangements.


Avian influenza H9, may be considered once every 80 days or so to strengthen immunity, as do Newcastle disease vaccine is recommended to consider using the new flow in Oil seedlings on the strengthening of the immune H9.


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