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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Clin+Microbiol
2016 ; 54
(5
): 1228-35
Nephropedia Template TP
gab.com Text
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Newcastle Disease Viruses Causing Recent Outbreaks Worldwide Show Unexpectedly
High Genetic Similarity to Historical Virulent Isolates from the 1940s
#MMPMID26888902
Dimitrov KM
; Lee DH
; Williams-Coplin D
; Olivier TL
; Miller PJ
; Afonso CL
J Clin Microbiol
2016[May]; 54
(5
): 1228-35
PMID26888902
show ga
Virulent strains of Newcastle disease virus (NDV) cause Newcastle disease (ND), a
devastating disease of poultry and wild birds. Phylogenetic analyses clearly
distinguish historical isolates (obtained prior to 1960) from currently
circulating viruses of class II genotypes V, VI, VII, and XII through XVIII.
Here, partial and complete genomic sequences of recent virulent isolates of
genotypes II and IX from China, Egypt, and India were found to be nearly
identical to those of historical viruses isolated in the 1940s. Phylogenetic
analysis, nucleotide distances, and rates of change demonstrate that these recent
isolates have not evolved significantly from the most closely related ancestors
from the 1940s. The low rates of change for these virulent viruses (7.05 × 10(-5)
and 2.05 × 10(-5) per year, respectively) and the minimal genetic distances
existing between these and historical viruses (0.3 to 1.2%) of the same genotypes
indicate an unnatural origin. As with any other RNA virus, Newcastle disease
virus is expected to evolve naturally; thus, these findings suggest that some
recent field isolates should be excluded from evolutionary studies. Furthermore,
phylogenetic analyses show that these recent virulent isolates are more closely
related to virulent strains isolated during the 1940s, which have been and
continue to be used in laboratory and experimental challenge studies. Since the
preservation of viable viruses in the environment for over 6 decades is highly
unlikely, it is possible that the source of some of the recent virulent viruses
isolated from poultry and wild birds might be laboratory viruses.