Final answer:
The International Classification of Diseases (ICD) is used in the U.S. to classify morbidity data in all settings. Morbidity rates measure the incidence of diseases, while the Morbidity and Mortality Weekly Report (MMWR) provides updates on public health issues.
Step-by-step explanation:
In the U.S., the system developed to classify morbidity data in all settings is the International Classification of Diseases (ICD), maintained by the World Health Organization (WHO). The ICD is instrumental in clinical fields as it provides criteria and methods for measuring disease burden, including tracking the morbidity and mortality rates. These rates are defined as the number and percentage of cases and deaths due to diseases within a population, respectively. Notifiable diseases are additionally monitored through epidemiological studies, and their data is disseminated via publications such as the Morbidity and Mortality Weekly Report (MMWR), compiled by the Centers for Disease Control and Prevention (CDC).