Final answer:
Smallpox is a highly contagious viral disease caused by the variola virus. It has a high mortality rate, with four in 10 victims dying. The disease spreads through respiratory droplets and close contact with infected individuals.
Step-by-step explanation:
Smallpox is a virus that is spreading through Valley Forge, four in 10 of its victims die. Smallpox is a highly contagious viral disease caused by the variola virus. It spreads through respiratory droplets and close contact with an infected person. The disease has had devastating effects throughout history, including decimating Native populations in the Americas.