Mezue ahịrịokwu na-esonụ: Republic Records kwupụtara na Eprel 2015 na a ga-agbanwegharị "Bad Blood" ka ọ bụrụ nke anọ site na "1989". E wepụtara nsụgharị remix nke onye rapper Kendrick Lamar na May 17, 2015, maka nbudata dijitalụ site na Big Machine Records. A kwadoro ntọhapụ nke otu ahụ site na mmalite nke vidiyo egwu ya na
2015 "Billboard" Music Awards. "Bad Blood" nwere mmetụta na redio US nke oge a na May 19, 2015, n'okpuru akara Big Machine na Republic Records. E wepụtara abụ ahụ na redio Italiantali nke oge a na June 12, 2015, site na Universal Music Group.