long list of risky health problems including cancer, diabetes, asthma, HIV infection and heart disease. Being overweight or obese is a category that qualifies roughly 70% of people in this age group.The Centers for Disease Control and Prevention says these people may get a booster, but stopped short of a full recommendation:— People 18 to 49 who got their Pfizer shots at least six months ago with risky health problems can consider the booster based on their individual benefits and risks.— Anyone 18 to 64 with a risky job, such as health care, can consider boosters.