9676
The notion of a weak form of a disease causing immunity to the virulent version was not new ; this had been known for a long time for smallpox .
 disease: smallpox
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 disease: smallpox