We are giving top priority to investigating the cause, but we still have not been able to find an answer.
We are trying to improve its accuracy more.
We are in the middle of investigating how to make that simpler.
We should think about that more.
We feel those improvements are insufficient.
The results of our discussion haven't come together yet.
However, they have not yet identified the means of transmission, effective treatments or prevention.
We need to talk more about that.
Our suggestions were, in effect, almost the same.
At this point, there has not been a solution to this problem found.