Volume 24, Number 7—July 2018
Research
Mapping of the US Domestic Influenza Virologic Surveillance Landscape
Figure 3

Figure 3. Number of influenza tests reported by public health laboratories to CDC since 2010. The number of specimens tested varies with the severity of the season. Since 2010, an average of 77,000 specimens has been tested annually. Multiple tests may be performed on a single specimen. Most tests have been PCR.
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