Final answer:
In a toddler with cystic fibrosis and a respiratory infection, the nurse would expect to see an increased viscosity of mucus.
Step-by-step explanation:
Cystic fibrosis is an autosomal recessive genetic disease that causes the production of sticky mucus that clogs respiratory and digestive organs. In the case of a toddler with cystic fibrosis and a respiratory infection, the nurse would expect to see an increased viscosity of mucus. This thick and sticky mucus obstructs the airways and makes it difficult for the toddler to breathe and clear the mucus from their lungs.