There are a number of conditions that people seeking permanency residency in the United States must meet in order to qualify. One of them, according to the U.S. Immigration and Nationality Act, is to meet certain health requirements. Without being cleared medically, a person cannot become a permanent resident of California or any other state.
Section 212 of U.S. Code 1182 states that a person may be barred from becoming a permanent resident if the individual is determined to possess a disease that significantly endangers the public health. This disease is communicable, meaning it can be transmitted from person to person through direct or indirect means. Determining whether a person has a contagious disease is performed in concert with regulations established by the U.S. Secretary of Health and Human Services.