Well, the most concerned are people who are, first of all, in developing countries and who don't have access to good medical care and may not have access at all to a hospital, should an epidemic occur in their country.
Bueno, son aquellos que, en primer lugar, viven en países en desarrollo y no tienen acceso a una buena atención sanitaria ni tampoco a los hospitales, en caso de que haya una epidemia en su país.