3772
The number of patients with suppression of HIV p24 antigenemia in the combination and zidovudine groups was six ( 40 % ) and two ( 11 % ) at week 4 ( p = 0 . 10 ) and five ( 45 % ) and two ( 14 % ) at week 24 ( p = 0 . 08 ) , respectively .
 Chemical: zidovudine
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:
 Chemical: zidovudine