my daughter and grandchild moved into a rental home 4 months ago next to a vacant lot that is overgrown and swampy, they recently heard noise in the attic that turns out to be a rat problem; they both have been sick for about 4 weeks and not getting better, congestion, stomach ache, achy, breathing ... I told her she needs to get out of there... they both have asthma ... can you please make us aware if this is a hazard to their health