What was in the blankets given to Native Americans at the end of Pontiac's Rebellion?

The correct answer is small pox

They believed at first that they would easily win with weapons in battles but when they saw that it was harder than believed, then they decided to get small pox onto blankets and handkerchiefs and give them to Native Americans and then it would spread among them and since they wouldn't be able to survive then the number of them would be reduced.