Increased Risk of Diseases In addition to the potential lack of new traditions being introduced to the home country, another point one could talk about is an increased risk of diseases. Many immigrants come to a country due to their original country having a serious disease or potentially deadly health conditions. According to Douglas W. MacPherson, a member of the faculty of health sciences, and Brian D. Gushulak, a member of the Medical Service Branch, about 2% of the population are immigrants and that “the factors that support and sustain the prevalence of diseases in the less developed world are beyond the control of national and state public health programs at the migrants ultimate destination, making national disease control and elimination nearly impossible.” One example of this is tuberculosis, or more commonly known as TB, a disease that severely affects the lungs and can be spread through the air when a person with the disease of the lungs or throat sneezes, talks, or coughs (NIH: National Institute of Allergy and Infectious Diseases, 2017). TB became prominent in populations with specific environmental, poverty-associated, or other behavioral risk factors. In many immigrant-heavy areas of the world, cases of TB now observed in the foreign-born population related to importation from high-prevalence source nations to low-prevalence host nations. This is also true when during late 2014, West Africa had experienced its largest recorded outbreak of Ebola, which is a potentially fatal illness that can be transmitted to people from wild animals and spread through human-to-human transmission. As the disease became more prevalent in the country Africans begin to feed other countries, especially Australia and Canada, spreading the disease to two other continents in the world, increasing one’s risk of obtaining the disease. This had caused the Australian government in October 2014 to cancel temporary visas for those who hadn’t come to Australia yet from Africa. This is very closely related to the case of tuberculosis, as both were spread more frequently partially due to the immigration of people from different parts of the world to the home country.