By Soo-hyang Choi and Josh Smith SEOUL (Reuters) – North Korea’s admission that it is battling an “explosive” COVID-19 outbreak has raised concerns that the virus could devastate a country with an under-resourced health system, limited testing capabilities, and no vaccine programme. The isolated North confirmed on Thursday its first COVID-19 infections since the pandemic emerged more than two years ago, shifting to the “maximum emergency epidemic prevention system” and imposing a national lockdown. On Friday it reported its first COVID-related death. State media have not confirmed the total nu…