The concept of using viruses — organisms commonly associated with disease — to combat cancer may appear counterintuitive. However, oncolytic virus therapy is emerging as a new immunotherapy approach. These are viruses that have been genetically modified or are naturally occurring. They are designed to selectively infect and kill tumour cells while leaving healthy cells alone. https://medium.com/@Nitin012/oncolytic-virus-therapy-using-viruses-to-kill-cancer-280b7ad372c5