Final answer:
Moraxella catarrhalis can cause infections in the respiratory system, including otitis media and rhinosinusitis.
Step-by-step explanation:
Moraxella catarrhalis is a bacterium that can cause infections in the respiratory system, particularly in the middle ear (otitis media) and the sinuses (rhinosinusitis). It is commonly associated with bacterial causes of otitis media along with Streptococcus pneumoniae and Haemophilus influenzae. In rhinosinusitis, Moraxella catarrhalis can be one of the common bacterial causes along with Streptococcus pneumoniae and Haemophilus influenzae. It is important to note that Moraxella catarrhalis is an opportunistic pathogen and typically affects individuals with compromised immune systems or underlying respiratory conditions.