The invention pertains to inhibitors bindable to regions of a virus. More particularly, the invention relates to inhibitors bindable to regions of flaviviral envelope glycoprotein, or flaviviral virus E protein, a class II viral E protein. Even more particularly, the invention relates to peptides inhibitory to virus-to-cell fusion and virus entry into animal cells. The invention also contains methods of determining said inhibitors, bindable to regions of the flaviviral E protein complex, (e.g., those of dengue and zika viruses) as candidates for in vivo anti-viral compounds that are also resistant to degradation by peptidases and thus extraordinarily suitable for oral, in addition to other, routes of administration.
