Figure 2.

 WBC level on gram stain was grouped as shown (described in detail in the “Methods” and the “Results”) and plotted against PN panel maximum copy number. As can be seen visually, there is a strong relationship between the semiquantitative copy number and gram stain–reported WBC. For example, for patients with ≥10⁷ copies/mL for a bacterial target on the PN panel, 70/85 (82.4%) had Moderate (2+) or Many (3+ or 4+) WBCs described on the gram stain, while only 15/85 (17.2%) were reported as having no WBCs. For Figure 2 as a whole, P < .00001, 5 × 3 chi-square. Abbreviations: PN panel, BioFire FilmArray Pneumonia panel; WBCs, white blood cells.