Two heat-labile factors in normal sera which neutralize variola virus.
D000906:Antibodies; D000941:Antigens; D005165:Factor V; D006358:Hot Temperature; D006801:Humans; D012899:Smallpox; D012901:Variola virus
D000906:Antibodies; D000941:Antigens; D005165:Factor V
ANTIGENS AND ANTIBODIES; SMALLPOX