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This is thought to be primarily a metabolic attribute of the vaccinating bacteria but may also involve competition for attachment sites.
This allows the coverage to be estimated from ageserological data if we make a further assumption about the timing and age-range vaccinated.
There is increasing evidence that pertussis continues to affect adolescents and young adults who were vaccinated as infants, albeit in a less severe form.
In fact, 85 % of the population is effectively vaccinated and will be protected against infection for life.
Sera has been systematically collected from mice and rats either harbouring a schistosome infection, or vaccinated with the isolated membrane preparation.
Of these, all but five (0.6 %) had been vaccinated at least 2 weeks prior to the cruise.
Four infants whose vaccination had not been completed at the time of pertussis were vaccinated shortly thereafter.
For reasons discussed above, reliable comparison of the tick populations on control and vaccinated cattle under comparable conditions was impossible to achieve in all cases.
Both epidemics would occur primarily in individuals who were in age groups immediately above those who were vaccinated when vaccination began.
When a new vaccination schedule with a dose at 11 months with catch-up campaign is introduced, all 11- 14-month-old children are vaccinated.
Here we assumed that 85 % of the population is effectively vaccinated at one year of age.
This has a large effect on the cost of vaccinating in the very young age groups.
No, <100 % of the own replacement animals were vaccinated every year or in some years there was no vaccination at all.
The remaining residents were not vaccinated because they refused.
The overall vaccination rate was 75.2% and the proportion of colonized children was not significantly different between unvaccinated (8.4%) and vaccinated (6.8 %) subjects.
