Related Clues:

• Microbiology subject
• Microscopic organisms, good and bad
• Early Earth life forms
• Potential health risks of tailless camel eating earth
• Stalin's enforcer concealed routine bugs
• Pasteur's study
• They may be examined on slides
• Bad thing to have on food
• I ate crab at sea, hence my indigestion?
• Bugs found in hair etc -- a bride's revolting
• Tiny creatures European found in ancient part of central Asia
• Possible cause of upset in cabaret, I suspect
• Potentially hostile agents work to break secret police chief
• European region ousting leader accepts deed is cause of complaint
• Cooked crab I ate, the source of digestive problems?