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Do scientists know when the AIDS virus first appeared?

Although doctors first identified cases of acquired immune deficiency syndrome (AIDS) in Los Angeles and New York City in 1981, they have since traced cases of the disease back to 1969. The human immunodeficiency virus (HIV), which causes AIDS, is transmitted through sexual contact, shared hypodermic needles, infected blood from transfusions, and from infected mothers to babies through breast milk. Researchers have been unable to ascertain the origin of the disease, but since the virus is similar to an immunodeficiency virus that affects monkeys, some speculate that the disease was somehow transmitted from monkeys to humans.

AIDS first appeared in Africa during the 1960s and 1970s, and it has spread to epidemic (widespread outbreaks) proportions on that continent. Millions of cases have been diagnosed worldwide, and every country in the...

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1. Origins
   1. How did early humans cure illness and disease?
   2. Who was the first doctor in history?
   3. What is the Hippocratic Oath?
   4. What are the four humors?
   5. When did biological warfare originate?
   6. Were there hospitals before the Middle Ages?
   7. When was the first North American hospital built?
   8. What advances were made in medicine during the Renaissance?
   9. How old is the concept of public health?
   10. What is Gray's Anatomy?
2. Modern Medicine
   1. When did modern medicine begin?
   2. Who invented vaccination?
   3. When did modern surgery begin?
   4. When was anesthesia first used?
   5. What surgical advances were introduced in the late twentieth century?
   6. Who introduced the use of antiseptics in hospitals?
   7. What are Louis Pasteur's contributions to the study of disease?
   8. When were antibiotics invented?
   9. Why are new antibiotics constantly being developed?
   10. Why is Florence Nightingale famous?
   11. When was the International Red Cross founded?
   12. Who discovered the X ray?
   13. Who was Clara Barton?
   14. What were the Curies' contributions to medicine?
   15. How did Jonas Salk and Albert B. Sabin save lives?
   16. When did the first heart transplant take place?
   17. When was the first test-tube baby born?
   18. When was the first kidney transplant?
   19. What is leprosy?
   20. What is the plague?
   21. Is yellow fever still a deadly disease?
   22. What was the first disease conquered by humans?
   23. Do scientists know when the AIDS virus first appeared?
   24. Who was Typhoid Mary?
   25. Has the flu ever reached epidemic proportions?
   26. What are CT and MRI scans?
3. Psychology
   1. Why are Pavlov's dogs famous?
   2. What is behaviorism?
   3. What were Sigmund Freud's contributions to the study of human psychology?
   4. What does the term "Jungian" mean?
   5. Who was Dorothea Dix
   6. What is depression?

1. Middle Ages