Between 1545 and 1550, the Aztec people of southern Mexico were affected by a serious disease that they could neither cure nor (9)
It was so serious, in fact, that up to eighty percent
of the entire population - 15
million people in total - are thought to
have died. For almost five centuries, scientists were unable to (10)
which specific disease was the cause. Scientists
had some (11)
such as smallpox, malaria, or
influenza, but it was not possible to (12)
that it was one of them. A new scientific study, however, might have solved this
medical (5)
The scientists had a chance to (13)
some ancient DNA found on victims of the disease.
Their (14)of this evidence (15)
that the cause was one type of bacteria called salmonella, which
remains a health problem even today.

the words:

analysis
committed
detectives
determine
examine
heal
mystery
prove
revealed
suspects