title: A comparative study of smallpox vaccination techniques under field conditions.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007117:Immunization, Secondary; D007223:Infant; D008297:Male; D008875:Middle Aged; D009339:Needles; D012899:Smallpox / Q000517:prevention & control*; D014611:Vaccination