Newcastle disease(ND)
occurance: world wide ,very common ,very virulent.
newcastle is a notifiable disease.
species affected:all species ,one of the most common respiratory disease of poultry.
age affected : all ages of poultry.
causes: newcastle disease virus is single strain , non segmented , RNA virus ,envelope and belong to paramixoviridae family .
there are three pathotypes
1-lentogenic (mild disease)
2-mesogenic (moderate disease)
3-velogenic(sever morbidity and mortality)
newcastle is air borne disease spreads by inhalation or by ingestion virus.
incubation period : 2-15 days
symptoms: twisted neck , immunosuppretion ,paralysis ,incoordination and central nervous signs following the initial respiratory signs which are diagnostic of newcastle disease virus .
watery eye and blug in the eye is seen with lentogenic strain .
coughing , gasping and sane mortality are seen with mesogenic strain .
egg production and quality of egg are affected .
it may produce "torticollis" paralysis , bloody diarrhea .
high morbidity and mortility occur with velogenic strain .
special note
species affected:all species ,one of the most common respiratory disease of poultry.
age affected : all ages of poultry.
causes: newcastle disease virus is single strain , non segmented , RNA virus ,envelope and belong to paramixoviridae family .
there are three pathotypes
1-lentogenic (mild disease)
2-mesogenic (moderate disease)
3-velogenic(sever morbidity and mortality)
newcastle is air borne disease spreads by inhalation or by ingestion virus.
incubation period : 2-15 days
symptoms: twisted neck , immunosuppretion ,paralysis ,incoordination and central nervous signs following the initial respiratory signs which are diagnostic of newcastle disease virus .
watery eye and blug in the eye is seen with lentogenic strain .
coughing , gasping and sane mortality are seen with mesogenic strain .
egg production and quality of egg are affected .
it may produce "torticollis" paralysis , bloody diarrhea .
high morbidity and mortility occur with velogenic strain .
special note
VVND (viscerotropic velogenic newcastle disease )
It is a notifiable disease , it is a very common viral disease of poultry.
most poultry are vaccinated several times against this virus.
causes :
this disease was named after a town in England where it was first seen .
single strain ,RNA virus , non segmented , envelope and belong to paramixovirus.
three pathogen strains exist
1-lentogenic (mild disease )
2-mesogenic (moderate disease )
3-velogenic(high morbidity and mortality )
species affected :
all species of birds of all ages are susciptable to this acute to chronic disease .
it is the most common of respiratory diseases .
mode of transmition
air borne disease (inhalation or ingestion )
free flying birds may be infected with lentogenic strains.
clinical signs
coughing , gasping and sane mortality are seen with mesogenic strain .
egg production and quality of egg are affected .
it may produce "torticollis" paralysis , bloody diarrhea .
high morbidity and mortality occur with velogenic strain .
brown broiler eggs convert into white egg
incubation period
2-15 days
exotic , rarley occur in commercial poultry in the united state .
outbreaks in pet bird population are more frequent .
prevention
vaccination in one day age in the hatchery using a course spray machine .
multiple live and killed vaccine are given to broiler in area with VVND .
pullets and often layers multiple live and killed VDV vaccine
B1+B2 +lasota strain are normally used.
A recombinant NDV vaccine
It is a notifiable disease , it is a very common viral disease of poultry.
most poultry are vaccinated several times against this virus.
causes :
this disease was named after a town in England where it was first seen .
single strain ,RNA virus , non segmented , envelope and belong to paramixovirus.
three pathogen strains exist
1-lentogenic (mild disease )
2-mesogenic (moderate disease )
3-velogenic(high morbidity and mortality )
species affected :
all species of birds of all ages are susciptable to this acute to chronic disease .
it is the most common of respiratory diseases .
mode of transmition
air borne disease (inhalation or ingestion )
free flying birds may be infected with lentogenic strains.
clinical signs
coughing , gasping and sane mortality are seen with mesogenic strain .
egg production and quality of egg are affected .
it may produce "torticollis" paralysis , bloody diarrhea .
high morbidity and mortality occur with velogenic strain .
brown broiler eggs convert into white egg
incubation period
2-15 days
exotic , rarley occur in commercial poultry in the united state .
outbreaks in pet bird population are more frequent .
prevention
vaccination in one day age in the hatchery using a course spray machine .
multiple live and killed vaccine are given to broiler in area with VVND .
pullets and often layers multiple live and killed VDV vaccine
B1+B2 +lasota strain are normally used.
A recombinant NDV vaccine
No comments:
Post a Comment