"Statistics Overview | Statistics Center | HIV/AIDS | CDC". 2018-12-31. "India". www.unaids.org. "The epidemiologyofHIV in Canada". www.catie.ca. Archived from
The global pandemic ofHIV/AIDS (human immunodeficiency virus infection and acquired immunodeficiency syndrome) began in 1981, and is an ongoing worldwide
timeline ofHIV/AIDS, including but not limited to cases before 1980. Researchers estimate that some time in the early 20th century, a form of Simian immunodeficiency
HIV/AIDS originated in the early 20th century and has become a major public health concern and cause of death in many countries. AIDS rates vary significantly