Vaccination against smallpox.  I.  Lyophilized vaccinia virus from infected chorio-allantoic membranes.
D000482:Allantois; D005612:Freeze Drying; D006801:Humans; D012899:Smallpox / Q000276:immunology*; D014611:Vaccination; D014616:Vaccinia virus
SMALLPOX/immunology