The invention is in particular related to a method for the selective survival or selective growth of a target cell comprising the steps of: a) contacting the target cell with a conjugate compound A-B, wherein A is a selective antibody or antibody derivative recognizing the target cell and B is a biotic agent able to at least partially inactivate an anti-bios agent, said anti-bios agent is able to inhibit the growth of cells; and b) contacting the target cell with the anti-bios agent. The present invention also relates to said conjugate on its own, a selection medium for cells comprising said conjugate and cells that are selected or recognized using a method or conjugate according to the present invention. The present invention further elucidates a pharmaceutical compound or composition, a kit for the detection of a target cell or for the diagnosis of diseases caused by the target cell or a product that can be used in the therapy of infectious related diseases comprising a conjugate according to present invention.