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Fig. 3 | Virology Journal

Fig. 3

From: Spectroscopic methods for COVID-19 detection and early diagnosis

Fig. 3

a Average raw spectra and b pre-processed spectra for saliva (n = 2), pure COVID-19 virus in different concentrations (n = 28, 1 × 105–98 copies/mL), and saliva + virus in different concentrations (n = 63, 1 × 105–24 copies/mL). c PCA scores and d PCA loadings on PC1 vs. PC2 for the pre-processed data. Inset c1 and c2 show both low concentration (≤ 781 copies/mL) and high concentration (≥ 1.25 × 10.4 copies/mL) of mixed saliva/virus. (With permission from [49])

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