Examples of varicella

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In certain age groups, the percentage of varicella cases changed during the observed period.
The force of varicella infection due to zoster was assumed to be 1 % of the total force of varicella infection.
Predicted age distribution of varicella associated inpatient days (morbidity measure) at equilibrium by vaccine coverage (base case vaccine used).
For strategies 1, 2 and 3 the number of cases of varicella at equilibrium would be identical.
The mean length of stay in hospital was 4.2 days for varicella and 12.7 days for zoster.
Congenital anomalies following maternal varicella infection during early pregnancy.
Since the epidemiology of varicella varies worldwide, adopting foreign prevention policies may not always be applicable.
In these geographic areas, varicella is endemic, with periodic peak years.
A reduction of varicella incidence after mass immunization could lead to an increase in the incidence of zoster.
Sample sizes were calculated to achieve confidence intervals of approximately 5 % for each age group, based on the expected level of immunity to varicella.
However, this strategy is expected to prevent 93 % of adult cases of natural varicella at equilibrium.
Various vaccine efficacy scenarios, vaccine coverages and vaccination strategies were investigated and a sensitivity analysis of varicella incidence predictions to important parameters was performed.
In temperate countries, it is often admitted that the annual incidence of varicella almost equals the size of the birth cohort.
The structure of the base matrix was chosen to reflect the importance of school transmission of varicella.
Finally, indirect evidence suggests that continued exposure in life to circulating varicella virus decreases the risk for developing shingles [7- 9].
These results illustrate that school and preschool contact patterns play an important role in the dynamics of varicella.
This suggests that preschool and school-age mixing is an important determinant of varicella transmission as with other childhood infections such as measles and rubella.

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