65699
Because of autoinfection , humans have been known to still be infected up to 65 years after they were first exposed to the parasite ( e.g. , World War II or Vietnam War veterans ) .
 World War II, Vietnam War
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 World War II, Vietnam War