In this issue: Why you need both COVID-19 vaccine doses, ventricular fibrillation, kids and exercise, how to say 'no' and more

For anyone who receives the Moderna or Pfizer COVID-19 vaccines, two doses are required to complete the series and be fully vaccinated. Learn why it's important to receive both doses.

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Why you shouldn’t forgo your second COVID-19 vaccine dose For anyone who receives the Moderna or Pfizer COVID-19 vaccines, two doses are required to complete the series and be fully vaccinated. Learn why it's important to receive both doses. Read more ›

COVID-19 resources and guidance from Mayo Clinic

Ventricular fibrillation Without fast treatment, this heart rhythm problem can cause death within minutes. Learn the warning signs and what actions to take to save a life. Read more › Advertisement Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Advertising & Sponsorship Policy | Opportunities | Ad Choices Chronic traumatic encephalopathy This type of brain degeneration is likely caused by recurrent concussions, but what causes the damage isn't well understood. Read more › Uterine artery embolization: Treat fibroids without surgery This procedure can treat uterine fibroids and reduce symptoms without surgery. Read more ›

ADDITIONAL HIGHLIGHTS Kids and exercise: How much activity do they need? Bladder outlet obstruction: Causes in men? Master the art of saying no

Guide to Your Baby's First Years An easy-to-use and comprehensive how-to manual for caring for your child, newborn to three. Learn more

HEALTHY TIPS & RECIPES Senescent cell removal Recent studies examine the link between cognitive impairment and senescence. Learn more Senescent cell removal Recent studies examine the link between cognitive impairment and senescence. Learn more Fast food tip: Get grilled Skipping fried and breaded fast foods will help you stay on your healthy-eating plan. Learn more Fast food tip: Get grilled Skipping fried and breaded fast foods will help you stay on your healthy-eating plan. Learn more Trusted health tools Use these simple calculators and self-assessments for personalized health tips. BMI Calculator | Calorie Calculator Trusted health tools Use these simple calculators and self-assessments for personalized health tips. BMI Calculator | Calorie Calculator Symptom checker Use our Symptom Checker to explore possible causes of your symptoms based upon Mayo Clinic's patient care experience. Check symptoms Symptom checker Use our Symptom Checker to explore possible causes of your symptoms based upon Mayo Clinic's patient care experience. Check symptoms Caesar salad with grilled chicken Romaine lettuce has more vitamin A, vitamin C, folate and calcium than iceberg lettuce does. See recipe Cranberry orange muffins When baking, use Greek yogurt to reduce or replace shortening, oil or butter. This cuts fat and makes muffins extra moist and tender. See recipe

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