12458
MAIN OUTCOME MEASURE : A positive test result for gonococcal or chlamydial infection by the ligase chain reaction assay ; secondary outcome measure was a positive test result for human immunodeficiency virus ( HIV ) .
 ligase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 ligase