Today’s interesting fact has to do with Medicine and Zoonoses.

We often think of the possibility of humans catching diseases from animals, pets, domesticated or wild.

Go anywhere these days and you will hear Mothers telling their children to not touch an animal because they could catch something.

A disease that transfers to humans from animals is a zoonose.

Flu, Rabies, SARS, Salmonella, toxoplasmosis and HIV are a few of the diseases that have regularly made the transition from animal to human.

Bovine tuberculosis is another disease that can sometimes infect people through their milk.

Herds that have been identified as having TB have been culled to prevent this from occurring.

It is often thought that TB crossed from Cattle to Humans when they were fist domesticated.

However, gene sequencing has shown that the TB that infects cattle originally came from the humans; their TB is a descendant of ours.

Researchers thought that that armadillos would be good subjects to test leprosy treatments on, because of their low body temperature.

When researchers realised that wild armadillos carried leprosy, it was suggested that it had always existed in the new world, and had not been imported from the old world by European settlers as originally thought.

Alerts recently went out asking people to not touch or interact with the animals.

But gene sequencing has shown that the leprosy infecting wild armadillos actually had crossed over very recently from humans and has not had the chance to mutate into a new separate species of bacteria, so it looks like the European settlers did bring it with them.