by Issam Ahmed and Lucie Aubourg Agence France Presse WASHINGTON, United States (AFP) — Drugmaker Moderna says it has started Covid-19 vaccine trials for thousands of children aged under 12, a first step towards a new phase of the immunization campaign experts say might be necessary to stamp out the pandemic. While children are generally spared the worst of the disease, under-18s account for roughly a fifth of the US population of 330 million, […]