2735
In Japan , a nationwide prevention program against mother - to - infant infection by hepatitis B virus ( HBV ) started in 1985 .
 Disease: infection by hepatitis B virus
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: infection by hepatitis B virus