Radicalization is the process by which people come to adopt increasingly extreme political, social or religious ideologies. When radicalization leads to violence radical thinking becomes a threat to national security. Prevention and de-radicalization programs are part of a set of strategies used to combat violent extremism, which are collectively known as Countering Violent Extremism (CVE). Prevention programs seek to stop the radicalization process from occurring and taking hold in the first place. De-radicalization programs work with violent extremists and attempt to alter their extremist beliefs and violent behavior with the aim to reintegrate them into society. In this paper we introduce a simple compartmental model suitable to describe prevention and de-radicalization programs. The prevention initiatives are modeled by including a vaccination compartment, while the de-radicalization process is modeled by including a treatment compartment. We calculate the basic reproduction number 查看全文>>