Meningitis – Neisseria — United States
“The purpose of declaring an outbreak is to determine when appropriate public health interventions should be considered. In contrast to previous guidance in which a threshold of 3 cases of the same serogroup with an attack rate of more than 10 cases per 100 000 population during a 3- month period was used to define both organization- and community-based outbreaks, the current guidance does not recommend the use of an absolute threshold. However, the following thresholds can be considered as
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