What are the varicella immunization recommendations for person born outside the U.S. before 1980?
If they do not meet one of the other evidences of varicella immunity, then they should receive two doses of varicella vaccine at the age-appropriate intervals. Evidence of varicella immunity is defined in the ACIP varicella recommendations, http://www.cdc.gov/mmwr/pdf/rr/rr5604.pdf [698KB – 48 pages] (page 16).