Final answer:
The Centers for Disease Control and Prevention (CDC) provides preventive measures against infection.
Step-by-step explanation:
The department that provides preventive measures against infection is the Centers for Disease Control and Prevention (CDC). The CDC is the main national public health agency in the United States and is responsible for protecting the public from diseases and injuries. They oversee the National Notifiable Disease Surveillance System (NNDSS) and work in cooperation with regional, state, and territorial public health departments to monitor and control the spread of infectious diseases.