Final answer:
The American Hospital Association (AHA) compiled the first disease classification system in the U.S.; nowadays, the CDC oversees disease surveillance and uses WHO's ICD for classifying diseases.
Step-by-step explanation:
The American Hospital Association (AHA) compiled the first disease classification system in the United States before the adoption of the International Classification of Diseases (ICD), which was developed by the World Health Organization (WHO). However, it is the Centers for Disease Control and Prevention (CDC) that plays a key role in disease classification and public health surveillance in the United States today. The CDC oversees the National Notifiable Disease Surveillance System (NNDSS), which tracks notifiable diseases on a national level. Moreover, the ICD system by WHO, which provides a standard taxonomy for all types of diseases including viral infections, is used in clinical fields internationally.