Your blood count would suggest that you have an infection. Your cough
and low oxygen saturation
would suggest that this infection was possibly in your lung. The shot they gave you was low-molecular weight heparin
which is often given to patients whom are placed in bed, to prevent blood clotting in the veins in your leg, which can happen if you are not ambulant. After an infection in the lung , coughing can persist for days after the infection is treated effectively .