scholarly journals Avian influenza and Newcastle disease virusindead chickens in markets in Dhaka, Bangladesh in 2011-2012

2017 ◽  
Vol 33 (1) ◽  
pp. 8-15
Author(s):  
LR Barman ◽  
RD Sarker ◽  
BC Das ◽  
EH Chowdhury ◽  
PM Das ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Avian Influenza ◽  
Newcastle Disease ◽  
Rapid Test ◽  
Type A ◽  
Antigen Test ◽  
Rt Pcr ◽  
Test Kit ◽  
Live Bird

A virological survey for avian influenza (AI) and Newcastle disease (ND) was conducted in two selected live bird markets (LBMs), namely Kaptan Bazar and Karwan Bazar in Dhaka city, Bangladesh from August 2011 to July 2012. A total of 513 dead chickens were collected. An immune-chromatographic rapid antigen test for Type A influenza virus and both conventional and real time RT-PCR were used for the detection and characterization of AI and ND viruses. All carcasses were first screened by the rapid antigen test kit and 93 were positive for Type A influenza virus. RT-PCR on a representative number of rapid antigen test positive samples (n = 24) confirmed the presence of Type A influenza virus and mostly H5 influenza virus (22 out of 24 tested samples). Influenza rapid test negative samples (n = 420) were subjected to routine necropsy. Heat stress, suffocation and physical injury were the most common cause of mortality (163 cases), followed by ND, suspected to be the cause of 85 deaths. On molecular investigation of these 85 samples, the presence of ND virus was confirmed in 59 and AI virus in 6; 15 were negative for both ND and AI viruses and 5 were unsuitable for investigation. Among the 59 ND confirmed cases 18 also contained AI virus. In summary, out of 513 carcasses 117 (22.81%) contained AI virus and 59 (11.50%) contained ND virus. Eighteen (3.51%) carcasses contained both AI and ND viruses. The findings suggest that both AI and ND should be considered as major threats to the poultry industry.Bangl. vet. 2016. Vol. 33, No. 1, 8-15

scholarly journals Broilers of live bird markets at Mymensingh city carrying H9N2 Avian influenza virus in their respiratory tract

2018 ◽  
Vol 5 (2) ◽  
pp. 225-233
Author(s):  
Sanzida Rahman ◽  
Afroja Yasmin ◽  
Tahmina Ruba ◽  
Mohammad AHNA Khan
Keyword(s):  
Influenza Virus ◽  
Avian Influenza ◽  
Matrix Protein ◽  
Histopathological Examination ◽  
Type A ◽  
Main Concern ◽  
Rt Pcr ◽  
Live Bird Markets ◽  
Live Bird ◽  
Apparently Healthy

Avian influenza (AI) caused by Type A influenza virus is a global zoonosis, infecting vast majority of mammalian and avian species. Broilers are meat type birds and randomly reared and sold by the farmers in Bangladesh with poor biosecurity. This study was aimed to identify the Type and subtypes of AI viruses in the broilers of two live bird markets, Mymensingh. A total of 10 birds from each of the market were randomly selected, investigated by clinical, pathological, reverse transcriptase polymerase chain reactions (RT-PCR), sequencing and sequence analysis. Out of 20 birds investigated, 06 were sick, 02 were dead and 12 were apparently healthy. Clinically, the sick/dead birds did not reveal any changes typical to AI. During necropsy, the sick/dead birds showed congested lungs and moderate hemorrhages in the trachea. Such lesions was absent in the lungs of apparently healthy birds. Following histopathological examination interstitial pneumonia with bronchitis was seen in sick/dead birds. The RT-PCR protocol was adapted to identify matrix protein gene of Type A influenza virus and amplified 430bp fragment is even cases. To identify the sub types of AI viruses involved, hemagglutinin (HA) and neuraminidase (NA) gene specific RT-PCR was carried out. 1475bp and 1089bp amplicons specific to HA and NA genes of AI viruses were generated in 07 cases. The cDNAs of HA and NA genes were sequenced, edited and revealed that the AI virus circulated in the live bird market of Mymensingh city is H9N2 subtype. Two sick, one dead and four apparently healthy birds found to carry H9N2 AI virus. The H9N2 virus is naturally low pathogenic for poultry, has got public health significance, and may donate partial or even whole cassette of internal genes to generate novel human-lethal reassortants of AI viruses; this was main concern for AI viral outbreak investigation in this study. It needs to examine large number of samples from wider sources to trace the rate of mutation and subsequent reemergence of pandemic AI viruses.Res. Agric., Livest. Fish.5(2): 225-233, August 2018

scholarly journals Detection of avian influenza virus and newcastle disease virus by duplex one step RT PCR

2013 ◽  
Vol 8 (6) ◽  
pp. 520-526 ◽  
Author(s):  
Dawid Nidzworski ◽  
Krzysztof Smietanka ◽  
Zenon Minta ◽  
Bogusław Szewczyk
Keyword(s):  
Influenza Virus ◽  
Avian Influenza ◽  
Newcastle Disease Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Egg Production ◽  
Influenza Viruses ◽  
Detection Methods ◽  
Rt Pcr ◽  
One Step

AbstractNewcastle disease Virus (NDV), a member of the Paramyxoviridae family, and Influenza virus, from the Orthomyxoviridae family, are two main avian pathogens that cause serious economic problems in poultry farming. NDV strains are classified into three major pathotypes: velogenic, mesogenic, and lentogenic. Avian influenza viruses (AIV) are also divided into: low pathogenic (LPAI) and highly pathogenic (HPAI) strains. Both viruses are enveloped, single stranded, negative-sense RNA viruses which give similar symptoms ranging from sub-clinical infections to severe disease, including loss in egg production, acute respiratory syndrome, and high mortality, depending on their level of pathogenicity. This similarity hinders diagnosis when based solely on clinical and post mortem examination. Most of the currently available molecular detection methods are also pathogenspecific, so that more than one RT-PCR is then required to confirm or exclude the presence of both pathogens. To overcome this disadvantage, we have applied a One Step Duplex RT-PCR method to distinguish between those two pathogens. The main objective of the project was to develop a universal, fast, and inexpensive method which could be used in any veterinary laboratory.

scholarly journals Prevalence of Newcastle Disease Virus and Avian Influenza Virus (H7N3) in Poultry at Karachi

2020 ◽  
Vol 11 (1) ◽  
pp. 1-6
Author(s):  
Amjad Ali Channa ◽  
Nazeer Hussain Kalhoro ◽  
Zaheer Ahmed Nizamani ◽  
Ayaz Hussain Mangi ◽  
Jamila Soomro
Keyword(s):  
Influenza Virus ◽  
Avian Influenza ◽  
Newcastle Disease Virus ◽  
Avian Influenza Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Virus Isolation ◽  
Economic Losses ◽  
Rt Pcr ◽  
Agar Gel

Background: Poultry is largest and rapidly growing sector of livestock in Pakistan. It is mainly influenced by viral pathogens such as Newcastle Disease Virus (NDV) and Avian Influenza Virus (H7N3). These viruses cause severe disease in poultry and leads to heavy economic losses throughout the world. The outbreaks of these pathogens have been increased in last few decades. Therefore, the study about antigenic prevalence is needed to know about the emergence of these pathogenic viruses, and to get rid of severe ailments associated with reduced poultry production. Objectives: To determine the prevalence of Newcastle Disease Virus (NDV), Avian Influenza Virus (H7N3) and co-infections in poultry flocks at Karachi. Methodology: For detection of NDV and H7N3, a total of 200 tracheal swabs were collected and tested through virus isolation (V.I); the sample with positive virus isolation were tested through agar gel precipitation (AGP) and then the RNA was isolated through TRI Reagent, which was further tested through reverse transcription polymerase chain reaction (RT-PCR). Results: The virus isolation showed that 58% of samples were positive for various viruses. Agar gel precipitation (AGP) revealed that the occurrence of NDV, H7N3 and ND+H7 were 50%, 8% and 38%, respectively. RT-PCR for F and HA gene of NDV and H7N3 confirmed the presence of NDV and H7N3 in the poultry. Conclusion: It is concluded that NDV and H7N3 are circulating in the flocks causing co-infections, therefore it is important to know the field challenge of viruses and to prepare vaccine of circulating serotype of virus to mitigate the rate of infection.

scholarly journals Evaluation of Rapid Detection Kit against Avian Influenza A Virus and H5 Subtype for Field Sample

2017 ◽  
Vol 21 (1) ◽  
pp. 48 ◽  
Author(s):  
Michael Haryadi Wibowo ◽  
Tri Untari ◽  
Sidna Artanto ◽  
Krisdiana Putri ◽  
Surya Amanu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Avian Influenza ◽  
Newcastle Disease Virus ◽  
Disease Virus ◽  
Sensitivity And Specificity ◽  
Newcastle Disease ◽  
Rapid Test ◽  
Specificity Test ◽  
Test Kit ◽  
Reaction Test

Avian influenza virus is poultry viral disease, which causes high economic losses. Various efforts have been made to control the disease. One effort is required screening fast and precise diagnostic test. This study was aimed to determine the potential of rapid test kit of AIV/H5 Anigen Rapid Test for the detection of AI virus types A and subtype H5 in the field. Some tests were carried out, e.g.: the potential test, cross-reaction test, sensitivity and specificity test. Potency test was done to evaluate potential of detection limits of the kit, by having the test of serial dilution of AI virus positive control. Cross-reaction test was done to detect antigens other than AI virus H5N1, e.g.:  IB virus of Massachuset strain, IBV strain 4-91, Newcastle Disease virus, and Escherichia coli. Sensitivity and specificity test were applied to the filed samples which clinically and laboratory were confirmed as H5N1 positive. To confirm the result of rapid test was then being done by reverse transcriptase polymerase chain reaction. Based on these results it can be concluded that, Anigen Kit AIV/H5 Ag Rapid Test can detect antigen-containing samples having AI virus HA titer up to 26of type A virus, and up to 25 for subtype H5 virus. Anigen Kit AIV/H5 Ag Rapid Test showed no cross-reactions with Infectious Bronchitis virus, Newcastle Disease virus, and Escherichia coli. Anigen A Rapid Test Kit AIV Ag showed a sensitivity of 50% and specificity of 100%, while Anigen Ag Rapid Test Kit AIV/H5 showed a sensitivity of 25% and specificity is 100%.

scholarly journals Surveillance of Avian influenza in Faecal Samples of Wild Birds at Sauraha, Chitwan National Park

2017 ◽  
Vol 34 ◽  
pp. 18-25
Author(s):  
Md. Hus. Azad ◽  
P. Manandhar ◽  
D. Sedai
Keyword(s):  
Influenza Virus ◽  
Avian Influenza ◽  
Avian Influenza Virus ◽  
National Park ◽  
Rapid Test ◽  
Wild Birds ◽  
River Bank ◽  
Test Kit ◽  
Faecal Samples ◽  
Chitwan National Park

Wild birds are the carrier of Avian influenza virus as reservoir. They spread virus through faecal drops. Considering this fact, a study was carried out to detect the avian influenza virus in fresh fecal swabs in Chitwan National Park, Sauraha. A total of 40 samples were collected from Baghmara Buffer zone community forest,30 samples from Rapti river bank and 10 samples from National trust for nature conservation areas. The faecal samples were collected during the summer season (March). The test was carried out by using a rapid test kit (synbiotic kit) USA. On rapid test, all the 80 samples were negative. All 80 samples were further inoculated in nine days embryonated eggs for haemagglutination tests for the confirmative diagnosis that showed negative result. Preliminary diagnosis revealed that wild birds were free from Avian Influenza in Chitwan National Park region.

Multiple RT-PCR Detection of H5, H7, and H9 Subtype Avian Influenza Viruses and Newcastle Disease Virus

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Feng Fei
Keyword(s):  
Influenza Virus ◽  
Avian Influenza ◽  
Newcastle Disease Virus ◽  
Avian Influenza Virus ◽  
Disease Virus ◽  
Newcastle Disease ◽  
Pcr Detection ◽  
Influenza Viruses ◽  
Rt Pcr ◽  
Avian Influenza Viruses

Objective: This paper focuses on the multiple detection RT-PCR technology of H5, H7, AND H9 subtype avian influenza viruses and Newcastle disease virus, and points out the specific detection methods and detection procedures of avian influenza and Newcastle disease virus. Methods: The genes of Newcastle disease virus carrying out the HA gene sequence of H5, H7 and H9 subtype AIV in GenBank were used to establish a strategy for simultaneous detection of three subtypes of avian influenza virus and Newcastle disease virus. Results: The results showed that the program can detect and distinguish H5, H7 and H9 subtype avian influenza viruses and Newcastle disease virus at one time. Conclusion: Multiple RT-PCR detection method has high detection sensitivity and can detect and determine different subtypes of avian influenza virus and Newcastle disease virus quickly and accurately, therefore, it has a crucial role in the detection and control of avian influenza H5, H7 and H9 subtypes and Newcastle disease.

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