In order to categorize the subtype of viruses, finally, the THz transmittance spectra via the sensing chips are characterized with two important parameters; the resonance frequency shift and the decrease of normalized transmittance value. The ΔT norm is again defined with the relationship between the decrease of normalized transmittance value and a mass of virus in the sample as following: ΔT norm = \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\frac{{T}_{buffer}-{T}_{v}}{m}$$\end{document}Tbuffer−Tvm, where T buffer is a transmittance maximum value for buffer solution without any protein, T v is a transmittance maximum value for virus contained protein, and m is a mass of virus sample calculated from concentration of virus samples. Δf is the shifted frequency from the maximum value of T buffer to T v. The transmission spectra for three virus samples (H5N2, H1N1, and H9N2) were mapped with two parameters, ΔT norm and Δf (Fig. 4), showing their own frequency shift and mass-normalized transmittance change. For three virus samples, ΔT norm and Δf were extracted from Fig. 2a. Especially, the H9N2 has a same surface protein, neuraminidase, with H5N2, but the location of it in the map is farther than H1N1. This is reasonable with the fact that each same subtype of virus has a same spike shaped protein, located outside of the virus but different strain in it. Therefore, it can be explained that H9N2 is located far from H5N2 in the map, since the difference of strain in the virus may be larger than other subtype of viruses. For the complete mapping of the subtype of the viruses, further substantial experiments with various types of samples to collect vast database will be worth.Figure 4Classified map for various virus samples as functions of the frequency shift and transmittance decrement per unit mass. The three different subtype virus show their own frequency shift and mass-normalized transmittance change.