In the past, black rats were the most commonly infected animals and hungry rat fleas would jump from their recently-dead rat hosts to humans, looking for a blood meal. Pneumonic plague, a particular form of plague infection, is instead transmitted through infected droplets in a sick person's cough.
Tin(IV) oxide is a constituent of the food contact surface that is the subject of FCN 235 (Use of tin antimony oxide [also known as antimony gray cassiterite] as a pigment for all polyolefins for food contact applications).
TIN, n. L. stannum; stagnum. 1. A white metal, with a slight tinge of yellow. It is soft, non-elastic, very malleable, and when a bar of it is bent near the ear, distinguished by a crackling sound called the cry of tin.