Although vaccines aren't the same thing as variolation, and were developed because of the inherent risks of microdosing a dangerous pathogen. They are called "v

Although vaccines aren't the same thing as variolation, and were developed because of the inherent risks of microdosing a dangerous pathogen. They are called "vaccines" because of the use of cowpox (a virus related to but much less dangerous than smallpox) in Jenner's vaccine and cow is "vacca" in Latin (similar to modern Spanish vaca).