 Half an hour after vaccination is administered, oxygen treatment will be initiated in group 2 and 3 at 6 Lmin via Oxymask and continued for 6 hours. During oxygen treatment peripheral oxygen saturation will be measured by pulsoximetry. In group 3, a single dose of Atorvastatin 80 mg will be given immediately prior to start of oxygen. Venous blood samples will be collected at 3, 6 and 8 hours after baseline. After the 8-hour blood sampling, the peripheral venous catheter will be removed and the study day ended. 