Anyone knows what "dai kong" means - it deals something with health or something... or maybe was it "kong dai" unless there are meanings to both 1) "dai kong" and 2) "kong dai"?
Anything to do with health, "Dai Kong" may mean 抵抗. Like Terence had written, meaning to resist.
As for "Kong dai", do you mean antibody - 抗體 "kong tai"?