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Appl. Environ. Microbiol., Aug 1997, 3199-3204, Vol 63, No. 8
M Chambon, C Jallat-Archimbaud, JL Bailly, JM Gourgand, F Charbonne, C Henquell, F Fuchs and H Peigue-Lafeuille
Significant intratypic differences in the glutaraldehyde (GTA) sensitivity
of echovirus isolates have been shown. While exploring ways to optimize the
study of GTA sensitivity of enteroviruses, we also observed intratypic
differences in poliovirus type 1 isolates collected in France. A suspension
procedure was used for assessing the virucidal effect of GTA at low
concentrations (< or = 0.10%) against purified viruses. Two recent
isolates of poliovirus type 1 tested were first fully characterized by the
PCR restriction fragment length polymorphism (RFLP) test. The RFLP pattern
of clinical isolate 5617 was similar to that of poliovirus type 1 LS-c, 2ab
(Sabin strain), confirming the vaccine origin of strain 5617. The RFLP
pattern of strain 5915 recovered from sewage was different from that of the
Mahoney strain, suggesting a genetic variation in this wild isolate. We
then analyzed under the same controlled conditions the GTA sensitivities of
both isolates and their respective prototype strains. The wild Mahoney and
5915 strains exhibited significantly lower sensitivities to GTA than did
the vaccine Sabin and 5617 strains. The inactivation rates of clinical
isolates 5617 and 5915 were very similar to those of their corresponding
reference Sabin and Mahoney strains. Both the conformational structure of
the capsid of each strain and the amino acid constitution of structural
polypeptides could be involved in the variations observed. The relevance of
our comparative sensitivity studies to standardization of virucidal tests
is discussed.
Copyright © 1997, American Society for Microbiology
Comparative sensitivities of Sabin and Mahoney poliovirus type 1 prototype strains and two recent isolates to low concentrations of glutaraldehyde
Laboratoire de Bacteriologie-Virologie, Faculte de Medecine et Pharmacie, Clermont-Ferrand, France.
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