PROS1 and swine influenza: The principal structural proteins in novel coronavirus 2019-nCoV that may be suitable targets for viral detection are spike (S) protein, membrane (M) protein, envelope (E) protein, and nucleocapsid (N) protein, and, in the case of other contagious respiratory diseases that have caused pandemics, such as swine flu, the targets are influenza virus M1 protein [86,87], or hemagglutinin (HA) and RNA glycoproteins and neuraminidase (NA) [70], as illustrated in Figure 3.