1.   In older horses infections rarely become patent but are often associated with persistent coughing and an increased respiratory rate.

2.   Consumer advocates worry that treating infections could become more difficult because some genetic engineering introduces antibiotic-resistant genes into food.

3.   Each ear infection becomes more difficult to treat.

4.   Fauci added that, to him, the discovery was more important for understanding how the AIDS virus infection becomes chronic.

5.   Most importantly, they are also found in many healthy people whose tuberculosis infection has not become virulent.

6.   The ability of bacteria that cause infections to become increasingly resistant to antibiotics, and the resistance insects develop to pesticides offer real life examples of evolution.

7.   The infection can also be passed from one person to another through fecal contamination, so secondary infections are now becoming a problem here.

8.   The primary infection becomes grossly swollen and painful, killing surrounding tissue and requiring large chunks of affected flesh to be surgically removed.

9.   Their immune systems fight off the bacteria, and the infection becomes dormant.

10.   What was believed at first to be a strep infection became tonsillitis.