Most patients who were critically ill presented with fever, cough, dyspnea, myalgias, malaise, weakness, tachypnoea, tachycardia, hypotension, cyanosis and low oxygen saturation. The most common presentation was with adult respiratory distress syndrome or an acute lung injury picture. 31% of these patients had superadded bacterial pneumonia. About 60-80% of these patients required mechanical ventilation [31] .