Let's talk about Covid-19 boosters

There's been a lot of talk about Covid-19 booster shots in recent weeks. It makes sense -- with colder months just around the corner in the northern hemisphere, public health authorities across the world are getting ready for a potential spike in coronavirus cases. Getting people at risk of severe disease boosted is a big part of the plan. But guidance on who, when and how depends largely on who you ask. Let's start with the basics: All adults should have had their first booster by now. The data shows clearly that an extra shot of an mRNA vaccine increases protection, including against severe disease. 'If you are 18 and older and have not yet had any vaccines beyond your primary vaccination, you should get your booster now,' said CNN medical analyst Dr. Leana Wen, an emergency physician and professor of health policy and management at the George Washington University Milken Institute School of Public Health.