scholarly journals Adoption of I2 Vaccine in Immunization of Village Chickens against Newcastle Disease Virus in Southern Tanzania: Immune Status of Farmer Vaccinated Birds

2012 ◽  
Vol 4 (4) ◽  
Author(s):  
Erick VG Komba ◽  
Albano O. Mbyuzi ◽  
Rutashobya CT Mulangila
Keyword(s):  
Newcastle Disease Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Immune Status ◽  
Village Chickens

scholarly journals Effect of Immunosuppression on Newcastle Disease Virus Persistence in Ducks with Different Immune Status

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Lucy W. Njagi ◽  
Phillip N. Nyaga ◽  
Lilly C. Bebora ◽  
Paul G. Mbuthia ◽  
Uswege M. Minga
Keyword(s):  
Newcastle Disease Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Immune Status ◽  
Experimental Period ◽  
Hemagglutination Inhibition Test ◽  
Viral Excretion ◽  
Antibody Titres ◽  
Antibody Levels ◽  
Chicken Embryo Fibroblasts

This study was carried out to verify the possibility that ducks are sources of Newcastle disease (ND) virus infection for chickens in mixed flocks. Immunosuppressed (IS) and non immunosuppressed (NIS) birds, at three different antibody levels (medium, low and absent) were used; the titres having been induced through vaccination, and Immunosuppression done using dexamethazone. Each of the 3 respective groups was further divided into 2 groups of about 12 ducks each: one challenged with velogenic ND virus; the other not challenged. Selected ducks from all groups had their antibody titres monitored serially using hemagglutination inhibition test, while two birds from each of the challenged groups were killed and respective tissues processed for ND viral recovery, using chicken embryo fibroblasts. In general, antibody titres of IS and NIS challenged ducks were significantly higher than their unchallenged counterparts (P<0.05). Non-challenged pre-immunised ducks had a progressive decrease in antibody levels; non-immunised ducks did not seroconvert. Newcastle disease virus was isolated from livers and kidneys of the challenged ducks throughout the experimental period; indicating a possibility of viral excretion, especially when the birds are stressed. It, therefore, provides another possible model of viral circulation within mixed flocks.

scholarly journals Immune Status Against Newcastle Disease Virus in Backyard Poultry of Punjab Province, Pakistan

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Muhammad Ali Qureshi ◽  
Sami Ullah ◽  
Muhammad Zubair Latif ◽  
Sadia Sarfaraz ◽  
Sohail Ahmed ◽  
...  
Keyword(s):  
Newcastle Disease Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Immune Status ◽  
Backyard Poultry ◽  
Punjab Province

scholarly journals Determination of serum antibody titres and immune status of layer flocks against Newcastle Disease virus at Chittagong district of Bangladesh

1970 ◽  
Vol 1 (2) ◽  
pp. 35-38 ◽  
Author(s):  
MA Kashem ◽  
M Parvej ◽  
MA Hashem ◽  
MM Moula ◽  
ASMG Kibria
Keyword(s):  
Newcastle Disease Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Immune Status ◽  
Haemagglutination Inhibition ◽  
Serum Antibody ◽  
Age Groups ◽  
Serum Samples ◽  
Specific Immunity ◽  
Antibody Titres

A study was conducted to assess the level of serum antibody titres and immune status of layer birds against Newcastle Disease virus by Haemagglutination Inhibition (HI) test in different areas of Chittagong district during November to December, 2010. Sixteen layer flocks were selected based on different ages of birds. A total of 235 serum samples were collected and tested at Microbiology laboratory of CVASU. HI test was performed using commercial Newcastle Disease vaccine (Avinew®) as a source of 4HAU virus antigen. The antibody titre (GMT) levels in 18-26 weeks age group were found to be 70.198, followed by 47.551, 34.776, 17.281 and 18.855 in 27-40, 41-57, 58-73 and >73 weeks age groups, respectively. Moreover, 100% specific immunity against ND was found in 18-26, 27-40 and 41-57 weeks age groups of birds, whereas 93.33 and 94.73% specific immunity was found in 58-73 and >73 weeks age groups, respectively. On an average, 97.87% layer birds showed specific immunity and 2.13% showed nonspecific immunity against NDV. We considered HI titre of 1:8 or above as specific immunity and less than 1:8 as non specific immunity. Highest HI titre was found at the age of 18-26 weeks and lowest titre was at 58-73 weeks of age. The lower level of HI titre seemed to be directly related to some important factors relating to vaccination which have been highlighted in this paper. Key words: Antibody titers; Immune status; HI test; Newcastle disease virus; Layer birds. DOI: http://dx.doi.org/10.3329/ijns.v1i2.8818 International Journal of Natural Sciences (2011), 1(2):35-38

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