Washington (AFP) – US biotech firm Moderna on Wednesday said it was pursuing regulatory approval for its Covid vaccine in children under six years old after the two-shot regimen was found to be safe and produced a strong immune response. Specifically, two doses of 25 micrograms given to babies, toddlers and preschoolers generated similar levels of antibodies to two doses of 100 micrograms given to young people aged 18-25, indicating there would be similar levels of protection. Children under six are the only age group that has yet to gain access to a Covid-19 vaccine in the United States. Base…