9691
OBJECTIVE : To follow - up prospectively patients with arthritis after infection with beta - haemolytic streptococci of Lancefield group A ( beta HSA ) , with emphasis on clinical characteristics and serological features .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None