85340
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 .
 Louis Agassiz, Amazon River
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Louis Agassiz, Amazon River