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. 2018 Jul;24(7):1300–1306. doi: 10.3201/eid2407.180028

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Number of influenza specimens tested for domestic surveillance in tier 4 (NIRCs) and tier 5 (CDC, Atlanta) laboratories. NIRCs receive specimens from tier 3 laboratories and are a major source of specimens for tier 5 laboratories. CDC, Centers for Disease Control and Prevention; NIRC, National Influenza Reference Center.