I have to admit, I love these trained-animal stories. From Tanzania Rats Learn to Detect TB Bacteria:
The giant pouched rats that have been trained to sniff out land mines in Africa are now learning to detect tuberculosis bacteria in human saliva with the help of a grant from the World Bank.
[...]
In his proposal, Weetjens said the rat, whose Latin name is Cricetomys gambianus, can sniff 120-150 human saliva samples in lab dishes in 30 minutes compared to the day’s work it takes for a human technician to analyze 20 samples. The rat stops in front of samples that smell like TB and waits to be rewarded but walks past samples where TB is not present.
[...]
The first batch of 12 rats trained to detect land mines are now at work in neighboring Mozambique and so far have sniffed out 20, Weetjens said.