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| n | National rate
lowest yet recorded |
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| u | Continued
monitoring needed to determine if low rates |
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| sustained and
due to vaccination |
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| u | Evaluation of
age-specific rates to assess impact of |
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| vaccination
strategy |
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| n | Rates
increasing in some states |
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| u | Occurring
among adults in high risk groups (e.g. MSM, |
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| drug users) |
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