At the Beekeeping Short Course at the Univ. of Ill. at Urbana-Champaign last
month, Mr. Omar Jassim, a forth year medical student I believe, gave a
lecture on bee sting reactions. He said that large local reactions can occur
up to 7 days later.  Anaphylactic reactions can have systemic reactions from
10 minutes to 72 hours after the stinging incidence.  It is a reaction to the
antigens in the body that were produced after the first incidence.
This person is at risk for another occurence if stung again.
Richard
Ky.,USA