"The latest blood tests carried out show zero viral load in his blood, the PCB said in a press release late Tuesday night.
Shadab was named in Pakistan's 15-member World Cup squad but couldn't fly with the team to England after tests revealed traces of hepatitis C in his blood stream.
The PCB sent him to Manchester to consult with Dr Patrick Kennedy, who had given the leg-spinner two week's medication and rehab course, which Shadab went through at the National Cricket Academy.
The PCB said Shadab would leave for England on May 16 and will consult Dr Kennedy the next day.
"It has been difficult to stay away from international cricket and watch Pakistan play. As a professional cricketer, you want to be part of the team's success. Having played in the 2017 Champions Trophy I understand the glamour, flavour and importance of global events," Shadab said.
"I am looking forward to competing in the World Cup and help Pakistan achieve success," he added.