If you suspect the presence of biological agents, put something around the mouth and nose to prevent inhalation. It is unlikely that you have a mask so improvise by wrapping a damp cloth made from a tight weave around the face. Cover all exposed parts and leave the area as soon as possible. Button/zip-up all clothing. Tuck trousers into socks, and wear gloves. When out of the danger area, wash thoroughly with soap and water. Clean teeth, hair and fingernails. Wash all clothing and equipment in hot soapy water.