Final answer:
Notifiable diseases that must be reported to the CDC's NNDSS include infectious diseases like HIV, measles, West Nile virus, and certain parasitic diseases. These reports help monitor public health threats and are published in the MMWR.
Step-by-step explanation:
In the United States, diseases that must be reported to the National Notifiable Diseases Surveillance System (NNDSS) of the CDC (Centers for Disease Control and Prevention) include a variety of infectious diseases considered to be of significant importance to public health. These notifiable diseases, such as HIV infection, measles, West Nile virus infections, and certain parasitic diseases like toxoplasmosis and Chagas disease, are monitored closely. Health professionals must legally report occurrences of these diseases, which are then compiled into the NNDSS and published in the Morbidity and Mortality Weekly Report (MMWR), allowing for tracking and informing public health strategies.