5071
Some historians argue against this figure , citing the absence of reliable censuses , the enormous mortality of diseases such as smallpox or African trypanosomiasis , and the fact that there were only 175 administrative agents in charge of rubber exploitation .
 disease: smallpox; disease: African trypanosomiasis
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; disease: African trypanosomiasis