Photo Credit: Fabrice Coffrini | Reuters At present, there is no evidence  that healthy children and adolescents need booster doses of the COVID-19 vaccine,  World Health Organization chief scientist Soumya Swaminathan said on Tuesday.  Speaking at a news briefing, she said that while there seems to be some waning of vaccine immunity over time against the fast-spreading Omicron variant of the coronavirus, more research is needed to determine who needs a booster shot. "There is currently no evidence  that healthy children or heavy adolescents need boosters. No evidence at all," he said.  Israel began offering boosters to children as young as 12, and the U.S. Food and Drug Administration earlier this month authorized the use of a third dose of the Pfizer and BioNTech COVID-19 vaccine for children aged 12 and 15.  Last week, Germany became the latest country to recommend that all children between the ages of 12 and 17 receive a COVID-19 booster shot. Hungary did it too. Swaminathan said the WHO’s top group of experts would meet later this week to consider the specific question of how countries should consider giving boosters to their populations. “The aim is to protect the most vulnerable, to protect those at highest risk of severe disease and dying. Those are our elderly populations, immuno-compromised people with underlying conditions, but also healthcare workers,” she said.