关于伤寒的流行病学，下列各项中不正确的是

A．病人与带菌者均是传染源

B．水源污染是重要传播途径，是爆发的主要原因

C．散发病例则多因进食污染食物引起

D．病后免疫力持久，少有第二次发病者

E．本病终年可见，夏秋季多

Felix is the sole director in F & G Ltd. Felix is also a partner in a partnership called Felix & Co.Advise F & G Ltd in the following situations:

(b) Felix has been negotiating a contract on behalf of F & G Ltd but the other party wishes to award the contract to Felix personally. Felix resigns from his position as director of F & G Ltd to take the contract personally. (5 marks)