CONTAMINATION OF BEEF CARCASSES DURING SLAUGHTERING IN TWO EGYPTIAN SLAUGHTERHOUSES ACETIC ACID AS AN INTERVENTION STRATEGY TO DECONTAMINATE BEEF CARCASSES IN EGYPTIAN SLAUGHTERHOUSES “Relation between vaccination time of ewes with RVF vaccine and immune response of both ewes and their lambs” Entomological surveillance for detection RVF virus activity in the risk areas in Egypt.