Alzheimer vs AIDS

The phone rang and the lady of the house answered : " Hello ".
" Mrs. Ward, please. "
" Speaking ¡­¡­ "
" Mrs. Ward, this is Doctor Jones from the Medical Testing Laboratory.
When your husband's doctor sent your husband's blood sample to our lab yesterday,
a blood sample from another Mr. Ward arrived as well,
and we are now uncertain which one is your husband's.
Frankly the results are either bad or terrible. "
" What do you mean ? " she asked nervously.
" Well, one of the specimens tested positive for Alzheimer,
and the other tested positive of AIDS.
We can't tell which is your husband's. "
" That's dreadful! Can't you do the test again? " questioned Mrs. Ward.
" Normally we can, but Medicare will only pay for these expensive tests one time. "
" Well, what am I suppose to do now ? "
" The people in the Medicare recommended that you
drop your husband off somewhere in the middle of town.
If he finds his way home, don't sleep with him. "