A one-year-old boy remains in a critical condition in a Hong Kong hospital after contracting Covid-19, the second infant confirmed as severely infected with the contagious disease within a week, according to health authorities.The Centre for Health Protection at the Department of Health said on Friday that both boys had good past health but had not been inoculated against Covid-19.The centre urged unvaccinated high-risk groups to get vaccinated, warning that the overall Covid-19 activity could...