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Global health
Globally, the CDC work with other organizations to address global health challenges and contain disease threats at their source. They work with many international organizations such as the World Health Organization (WHO) as well as ministries of health and other groups on the front lines of outbreaks. The agency maintains staff in more than 60 countries, including some from the U.S. but more from the countries in which they operate.[58] The agency's global divisions include the Division of Global HIV and TB (DGHT), the Division of Parasitic Diseases and Malaria (DPDM), the Division of Global Health Protection (DGHP), and the Global Immunization Division (GID).[59]
The CDC is integral in working with the WHO to implement the International Health Regulations (IHR), an agreement between 196 countries to prevent, control, and report on the international spread of disease, through initiatives including the Global Disease Detection Program (GDD).[60]
The CDC is also a lead implementer of key U.S. global health initiatives such as the President's Emergency Plan for AIDS Relief (PEPFAR) and the President's Malaria Initiative.[61]
https://en.wikipedia.org/wiki/Centers_for_Disease_Control_and_Prevention#Global_health
Trump took the reigns away from CDC to control the numbers.
The CDC works primarily with WHO, who can legally survey every country and every person in the world.
They can't do that without funding….which Trump cut off.