Covid-19 vaccines for younger children and booster shots for at least those over 65 years old are being prepared in accordance with a tight schedule in the US Covid-19 vaccines for younger children and booster shots for at least those over 65 years old are being prepared in accordance with a tight schedule in the US, as the Americans stagger into the 19th month of their fierce battle against the pandemic. A lower dose of the Pfizer-BioNTech coronavirus vaccine, one-third the amount given to adults and teens, is safe and triggered a robust immune response in children as young as five years old, the drug companies announced in a news release on Monday morning. “The finding, eagerly anticipated by many parents and paediatricians, is a crucial step toward the two-shot coronavirus vaccine regimen becoming available for younger school-aged children, perhaps close to Halloween,” Xinhua news agency quoted The Washington Post as saying on Monday. However, the companies must pr...