One virus paicle prevents multiplication of the 2nd virus. This phenomena is

Viral interferenceit is the infection of a cell by one virus inhibits simultaneous or subsequent infection by another virus.Most impoant mediator of interference is interferon.Interference produced by destruction of cell receptors is seen with myxoviruses and enterovirus.It is applied in the field in controlling poliomyelitis outbreaks by introducing into the population, the live attenuated poliovirus vaccine.