BARCELONA – Not two months after battling back the coronavirus, Spain’s hospitals are beginning to see patients struggling to breathe returning to their wards.The deployment of a military emergency brigade to set up a field hospital in Zaragoza this week is a grim reminder that Spain is far from claiming victory over the coronavirus that devastated the European country in March and April.Authorities said the field hospital is a precaution, but no one has forgotten scenes of hospitals filled to capacity and the daily death toll reaching over 900 fatalities a few months ago.While an enhanced testing effort is revealing that a majority of the infected are asymptomatic and younger, making them less likely to need medical treatment, concern is.