As companies race to create vaccines to alleviate the devastation caused by COVID-19, two companies -- Pfizer and Moderna -- say their vaccines are more than 90% effective in adults. But they don't know if their vaccines work in children, meaning the expected, imminent authorizations won't apply to children. … Doctors, including Dr. Anthony Fauci, predict that there could be a vaccine available for children by mid-to-late 2021. Typically, childhood vaccines are approved after being tested and showing promise in adults. Vaccine specialists say that ethically, it's appropriate to test a vaccine in adults before testing in children.