Hepatitis B virus preS1 deletion is related to viral replication increase and disease progression

Table 4 Ten types of polymorphism detected by fluorescence resonance energy transfer-based real-time polymerase chain reaction assay and their prevalences among the 341 detected subjects

Types	n (%)
WT only	241 (70.7)
15 del only	3 (0.9)
18 del only	3 (0.9)
21 del only	4 (1.2)
WT + 15 del	16 (4.7)
WT + 18 del	47 (13.8)
WT + 21 del	6 (1.8)
WT + 15 del + 18 del	18 (5.3)
WT + 18 del + 21 del	2 (0.6)
WT + 15 del + 18 del + 21 del	1 (0.3)
Total	341

WT: Wild type; 15, 18, 21 del: 15, 18, 21 base pair deletion mutant; FRET-based real-time PCR: Fluorescence resonance energy transfer-based real-time polymerase chain reaction.