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1lll In contrasts to non-standardized , standardized are widely used, fixed in terms of scope, difficulty and format, and are usually significant in consequences. Standardized are usually held on fixed dates as determined by the which may or may not be administered by , held within the classroom, or constrained by the classroom period. Although there is little variability between different copies of the same type of standardized , there is variability between different types of standardized .

Based on the low variability exhibited among known the strain is thought to have been detected by within weeks of its emergence among the The reproduction number may be higher in densely populated conditions such as those found on Many forms of preventive efforts may be employed in specific circumstances in order to reduce the propagation of
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