On August 27, 1900, Carroll allowed an infected mosquito to feed on him. He developed a severe case of yellow fever but helped his colleague, Walter Reed, prove that mosquitoes transmitted the feared disease.
Answer:
-having unprotected sex/sexual contact
-sharing needles
-mother to baby during pregnancy
-mother to baby while breastfeeding
-contaminated blood transfusions
yes because it shows that they know how to solve the problem in diffrent ways
