Avian Influenza and Newcastle Disease: A Field and by Illaria Capua, Dennis J. Alexander

By Illaria Capua, Dennis J. Alexander

Avian Influenza (AI) and Newcastle ailment (ND) are devastating ailments of fowl, which reason losses to the chook and effect the liveability of rural groups all over the world. Following the H5N1 epidemic they seem like endemic no less than in Asia, jap Europe, the center East and Africa. quite in case of AI outbreaks it really is crucial that an infection is clinically determined speedily and that isolates are made to be had to the foreign clinical community.

Currently, a number of businesses together with OIE, FAO and the EC have organised education classes in affected components. in spite of the fact that, frequently those classes don't hide all points of AI/ND analysis yet basically yes points. This leads to fragmented parts of information and within the program of other diagnostic protocols in numerous components of the world.

The target of this ebook is to supply a complete method of AI analysis starting from the scientific components that are meant to set off a suspicion within the box, to the submit mortem approach, selection of samples, processing/ cargo of specimens, virological, serological and molecular prognosis and instructions for notification.

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Additional resources for Avian Influenza and Newcastle Disease: A Field and Laboratory Manual

Example text

The subfamily Paramyxovirinae has five genera: Rubulavirus, which includes the mumps virus, mammalian para-influenza 2 and 4; Respirovirus containing mammalian para-influenza viruses 1 and 3; Morbillivirus, measles, distemper and rinderpest; Henipavirus, formed from the Nipah and Hendra viruses; and Avulavirus, formed from NDV and other avian paramyxoviruses (Lamb et al. 2005). Nine serogroups of avian paramyxoviruses have been recognised: APMV-1 to APMV-9 (Alexander 1988a). Of these, NDV (APMV-1) remains the most important pathogen for poultry, but APMV-2, APMV3, APMV-6 and APMV-7 are known to cause disease in poultry.

Usually the sequence is 113RQK/RR*F117 in virulent viruses, but most have a basic amino acid at position 112 as well. In contrast, viruses of low virulence usually have the sequence 113K/RQG/ER*L117. Thus, there appears to be the requirement of a basic amino acid at residue 113, a pair of basic amino acids at 115 and 116 plus a phenylalanine at residue 117 if the virus is to be virulent for chickens. e. trypsin-like enzymes. Therefore, in host cells the replication of lentogenic viruses is restricted to areas with trypsin-like enzymes, such as the respiratory and intestinal tracts, whereas virulent viruses can replicate and cause damage in a range of tissues and organs, resulting in a fatal systemic infection.

Although the NDV isolates placed in genogroups 1–5 (or I–VIII) are genetically quite close, viruses that were placed in geno-group 6 by Aldous et al. (2003), and later class I by Czeglédi et al. e. the class II viruses (Czeglédi et al. 2006). This has caused problems in molecular diagnosis, particularly as different primers are necessary for their detection in RT-PCR tests. J. Alexander infection with NDV has been demonstrated in at least 241 species from 27 of the 50 Orders of birds. It is highly probable that all bird species are susceptible to infection, but the outcome of infection in terms of disease varies considerably with different species.

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