Study design.

<p>Group A1, participants receiving PCECV according to the 4-site/1-week ID regimen; Group A2, participants receiving PCECV according to the 4-site/1-week ID regimen and HRIG at first visit; Group B1, participants receiving PCECV according to the 2-site/TRC ID regimen; Group B2, participants receiving PCECV according to the 2-site/TRC ID regimen and HRIG at first visit; PCECV, purified chick embryo cell culture vaccine; ID, intradermal; HRIG, human rabies immunoglobulin; TRC, Thai Red Cross; D, day; BD, blood draw. Administration schemes represent injection sites. The syringe symbolizes 1 injection of 0.1 mL of PCECV vaccine.