1. In a distributed network having a number of server computers and associated client devices, method of isolating infected client devices from uninfected client devices, comprising: correlating network related virus infection information; determining if a virus outbreak has occurred based on the correlated information; isolating infected client devices from uninfected client devices when the virus outbreak is confirmed; monitoring all data packets in the network for the virus; identifying a packet type associated with the virus; and blocking only the identified packet type.