Cyril Tommasone of France competes on the rings in the Artistic Gymnastics Men's Individual All-Around final on Day 5 of the London 2012 Olympic Games at North Greenwich Arena on August 1, 2012 in London, England.
Most humans are infected through the bites of immature ticks called nymphs. Nymphs are tiny (less than 2 mm) and difficult to see; they feed during the spring and summer months. Adult ticks can also transmit Lyme disease bacteria, but they are much larger and may be more likely to be discovered and removed before they have had time to transmit the bacteria. Adult Ixodes ticks are most active during the cooler months of the year