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He took a break in the spring of 1865 to join naturalist Louis Agassiz on a scientific expedition up the Amazon River , but aborted his trip after eight months , as he suffered bouts of severe seasickness and mild smallpox .
 person: Louis Agassiz; location: Amazon River; disease: seasickness; 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:
 person: Louis Agassiz; location: Amazon River; disease: seasickness; disease: smallpox