U.S. Food and Drug Administration vaccine advisers meet on Thursday morning to discuss the 'Opportunity to allow Moderna coronavirus vaccine boosters for certain adults. This is the first part of a two-day meeting of the Vaccines and Related Biologics Advisory Committee which will also include a recall vote for the Johnson & Johnson vaccine and a presentation on mixed vaccines. Thursday 's agenda focuses on Moderna boosters, and includes a presentation from Moderna and another from the FDA, which will provide its assessment of the data from Moderna reminder. Moderna urges the FDA to allow half a booster dose of its Covid-19 vaccine for certain adults Moderna is requesting approval for a booster dose of 50 micrograms, which is half the size of 100 microgram doses used in the primary two-dose vaccine series - at least six months after the second dose, and only for certain groups: people aged 65 and over; people aged 18 to 64 who are at high risk of severe Covid-19; and people aged 18 to 64 whose exposure to the coronavirus in their environment or work exposes them to complications from Covid-19 or to serious illness. Moderna's request reflects groups allowed to receive a booster dose du Pfizer mRNA vaccine . Third doses of Moderna and Pfizer Covid-19 vaccines are already authorized for some immunocompromised people. On Thursday, the committee will hear from Dr. Peter Marks, director of the Center for Biologics at the FDA. Evaluation and Research who recently took the interim lead of the agency's Vaccine Research and Review office as two of its senior executives ready to leave the agency . Learn more FDA to answer Moderna's recall question, J&J Covid-19s, including mixed plans Israeli researchers will also notify the VRBPAC recall data from there; most people in Israel received the Pfizer Covid-19, and recalls for those vaccinated began weeks before the United States allowed Pfizer recalls. The presenters, Dr Sharon Alroy-Preiss, director of public health services at Israel's Ministry of Health and Ron Milo, professor at Israel's Weizmann Institute, backed Pfizer's recall request last month. The meeting, which will be streamed online , is scheduled to last until 4:45 p.m. ET. A two hour discussion and voting period will begin at 2:45 p.m. ET. Receive the weekly CNN Health newsletter Register here to receive Results are available with Dr. Sanjay Gupta every Tuesday from CNN Health team. The committee of advisers indFDA dependents discusses and makes recommendations to the agency regarding vaccine authorizations and approvals, and the agency then makes the final decision on whether to accept a vaccine. If the FDA grants emergency use clearance for Moderna boosters, vaccine advisers from the U.S. Centers for Disease Control and Prevention will meet to discuss which groups to recommend them to. Typically, shots can be administered after the CDC Director has approved the recommendation. title = alt = > Advisory Committee on Immunization Practices is already scheduled to meet to discuss reminders from 10 a.m. to 5 p.m. ET October 20-21.