Belize has a high prevalence of communicable diseases such as respiratory diseases and intestinal illnesses. A number of highly communicable diseases are widespread, including tuberculosis, diarrheal diseases and malaria. Minnesota has a statute that criminalizes the transmission of certain communicable diseases including HIV. Public health includes water supply, sewerage and sanitation, eradication of communicable diseases etc. Passive surveillance is the most common type in tracking communicable diseases. The agents of communicable diseases are invaders; non-communicable diseases constitute internal insurrection or civil war. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases. Invasive species, including communicable diseases, were a byproduct of the exchange. Control of communicable diseases had priority over non-communicable ones. Tooth polishing should also be avoided in the case of allergies and communicable diseases. About 16,000 to 20,000 POWs died in those camps due to communicable diseases. Resistant bacteria are spread in much the same ways as any communicable disease. In 1986 LaRouche proposed that AIDS be added to California's List of Communicable Diseases. Contact tracing has been a pillar of communicable disease control in public health for decades. He is also the Director of the Center for Communicable Disease Dynamics.