1460
Although CB - 4 isolates were less resistant to chlorine than CB - 5 isolates , after 1 , 000 min of contact 0 . 01 % of the input virus was still infectious .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None