Examples of poliovirus

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Factors affecting the immunogenicity of oral poliovirus vaccine in developing countries : review.
This allows for identification of areas with ongoing poliovirus transmission and implementation of appropriate vaccination responses.
So far, such epidemics have been caused only by wild-type poliovirus strains, despite the heavy use of the live vaccines in adjacent regions or countries.
We describe changes in stool specimen sensitivity for poliovirus isolation during a time when wild poliovirus transmission has been rapidly declining.
Environmental samples from one or two cities/towns in each selected province were tested for poliovirus.
Investigators also arranged for stool specimen collection and shipment to the national polio laboratory network for poliovirus detection and identification.
At the same time, specimen sensitivity for the detection of wild poliovirus increased.
By reducing the susceptible population in this way, it was possible to break poliovirus transmission.
It is conceivable that such groups of individuals might also maintain the live vaccine strain of poliovirus.
Elimination of the poliovirus is thus one candidate to explain the observed decrease of seasonal variation.
This methodology can be adapted for use in other countries or regions to assess areas at increased risk for poliovirus circulation.
There is a good chance that transmission of wild polioviruses can be interrupted - and in our model that would suffice to eradicate the disease.
Likewise, the main stream of the sewage containing the suspended poliovirus is likely to bypass any dead ends along the migration route.
The estimation of an epidemiological link is based on this rapid evolution of poliovirus genome by studying the pattern of nucleotide variation.
Following a poliovaccine campaign, it is difficult to isolate poliovirus from sewage after 6 months.
It is concluded that environmental surveillance is a sensitive approach to monitor silent poliovirus circulation in populations served by a sewage network.
In the current experiments, a remarkably large proportion of input poliovirus was recovered from the sewage samples collected during the four successive days.
Since a high proportion of poliovirus infection are frequently sub-clinical, evidence for epidemiological links must be obtained from the laboratory data.

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