Identify an example of a viral pathogen.

Measles is an example of a viral pathogen because it is caused by the measles virus, which is a member of the Paramyxoviridae family. This virus is primarily spread through respiratory droplets when an infected person coughs or sneezes, and it can lead to severe health complications, including pneumonia and encephalitis.

In contrast, the other options refer to different types of pathogens: Penicillium is a genus of fungi, tuberculosis is caused by the bacterium Mycobacterium tuberculosis, and malaria is caused by protozoan parasites of the genus Plasmodium. Understanding the unique characteristics of viral pathogens like the measles virus compared to other types of pathogens is crucial for diagnosing and treating infectious diseases effectively.