In 2009, India established a National HIV and AIDS Policy and the World of Work, which sought to end discrimination against workers on the basis of their real or perceived HIV status. Under this policy, all enterprises are encouraged to establish workplace policies and programmes based on the principles of non-discrimination, gender equity, healthy work environment, non-screening for the purpose of employment, confidentiality, prevention and care and support. Researchers at the Overseas Development Institute have called for greater attention to migrant workers, whose concerns about their immigration status may leave them particularly vulnerable.