A method and apparatus for processing at least two types of payloads received at varying intervals in a communications network using a single processing path is provided. The shaft assembly selectively interconnects the end effector and the surgical device. A wider range of treatments such as CHD, SHD, and HD can be conducted without employing a device for the exclusive use of the CHD or CHDF. The players play the primary games of their respective gaming devices independently of the group bonus event. Furthermore, a computer program for carrying out this method and a data carrier storing such a program are provided. The invention can be applied to the development of mutants under-expressing, or no longer expressing, genes coding for an antigenic protein of Leishmania promastigote, and to the therapeutic andor vaccine-oriented uses thereof.