President Joe Biden announced the expansion of booster shots to millions more Americans. This affects people fully vaccinated with the Pfizer shot at least six months ago, such as seniors 65 and older and residents of nursing homes and long-term care centers.There are expected logistical challenges with the new booster offering. For many, pharmacies are likely options."So they can both document the dates to make sure they are outside that range and which vaccine the patient received," said Ron Fitzwater, of the Missouri Pharmacists Association.Health care workers and people between 50 and 64 with risky medical conditions may also get the Pfizer boosters. People older than 18 with health conditions should consider it, too."They're going to get pretty broad discretion for pharmacists, and other health care professionals to administer those shots," Fitzwater said.In a KMBC interview, White House COVID-19 advisor Cameron Webb said that the supply is there for those who still need to get a first or second shot."There are more than enough doses for the 70 million people to get their shots and for people to get their boosters. That's our plan," Webb said.The approved plan is not as broad as the one Biden first offered earlier, and it does not include people vaccinated with the Moderna nor Johnson & Johnson shots yet."Not cutting any corners, but we think it will be in a matter of weeks," Webb said.Kansas Gov. Laura Kelly has authorized the third shot. A spokesperson for the Missouri health department said they're sorting through what they call "mixed messages" from the federal government on boosters.