If possible, then there will be no requirement of creating billions of doses for vaccine and cold storage infrastructure. Also it can spread at a high rate and there will be no need of manual vaccination to all. I think in Pandemic times our research of vaccine should be in this way. In conventional method lot of time and money required and for poor and developing countries it will be very difficult to fill demand of vaccine to their people. If some one can create artificially a virus like corona then i think its time to create another virus which can act as vaccine and have low pathogenicity high infectivity and high immunogenicity.