Genotype	Injectable	Oral	Duration (weeks)	Rate of sustained virologic response (%)
1a and 1b	Pegylated interferon alfa-2a (Pegasys), 180 mcg weekly or Pegylated interferon alfa-2b (Pegintron), 1.5 mcg per kg weekly	Weight 165 lb (75 kg) or less: ribavirin (Rebetol), 1,000 mg daily Weight greater than 165 lb: ribavirin, 1,200 mg daily	48	45 to 50
2 and 3	Same as above	Ribavirin, 800 mg daily	24	70 to 80
4	Same as above	Weight 165 lb or less: ribavirin, 1,000 mg daily Weight greater than 165 lb: ribavirin, 1,200 mg daily	48	70