Volume 24, Number 7—July 2018
Research
Mapping of the US Domestic Influenza Virologic Surveillance Landscape
Figure 4

Figure 4. 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.
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