Health Secretary Matt Hancock speaks at Downing Street press conference

Bethany inquires about the prioritization of vaccines for those shielding but under 65. The Health Secretary explains that the Joint Committee on Vaccinations and Immunizations advises on clinical priorities, considering those clinically vulnerable. Interim guidance is based on current data from leading vaccines, with updates expected as more data becomes available.

What are the two leading vaccines mentioned in the text?

What role does Jonathan Van Tam play in the vaccine prioritization process?