From the argument, we gather that Schist has been primarily responsible for overall increase in infectious diseases.
Schist percentage remains same. With this information schist is still major contributor, so let us safely assume that schist makes up 60% of infectious diseases. If malaria made significant increases, then malaria may have gone from 15% five years ago to 40% now, still a substantial increase. Therefore this answer gives us good reason to believe schist had more cases than malaria
...
Schist percentage remains same. With this information schist is still major contributor, so let us safely assume that schist makes up 60% of infectious diseases. If malaria made significant increases, then malaria may have gone from 15% five years ago to 40% now, still a substantial increase. Therefore this answer gives us good reason to believe schist had more cases than malaria
...




