Question 12 0.5 pts In a study from Sao Paulo, Brazil. Investigators recruited 571 patients who successfully completed treatment for visceral leishmaniasis (a parasitic disease transmitted by a sandfly vector). These patients were followed for 24 months in a cohort study to measure the incidence rate of re-Infection with visceral leishmaniasis. One of the exposures they examined was HIV infection. Fifty-seven patients had HIV infection: these patients were followed for 1,370 person"months, and 18 of these patients were re-infected with visceral leishmaniasis, Five hundred fourteen patients did not have HIV infection; these patients were followed for 12.334 person months, and 21 of these patients were re-infected with visceral leishmaniasis. Calculate the rate ratio. 07.72 0.07 O.1.00 O0.11