2163
Production of VT was also examined retrospectively in 32 E . coli strains of serotype O26 : H11 isolated from children with diarrhoea ; eight ( 25 % ) of them produced moderate to high levels of verotoxin 1 despite several years storage in vitro .
 GENE: verotoxin 1
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: verotoxin 1