To answer the above question, the relevant sentence is: She collaborates with Sun Feng and other local epidemiologists and public health officials; they identify Emhoff as patient zero, with security video showing her as the common contact with the next three known victims at a Macau casino.
This justifies what answer for what question? Q & A:
Passage: In the opening days, Dr. Leonora Orantes, a WHO epidemiologist, traveled to Hong Kong to follow the Beth Emhoff lead. She collaborates with Sun Feng and other local epidemiologists and public health officials; they identify Emhoff as patient zero, with security video showing her as the common contact with the next three known victims at a Macau casino. Before she can leave, Feng kidnaps Orantes to use her as leverage to obtain (anticipated) MEV-1 vaccine doses for his village. Orantes spends months living with the villagers until the vaccine is announced. Feng exchanges Orantes for enough vaccine for his village. When her colleague reveals that similar kidnappings were widespread, and the doses were placebos, Orantes rushes back to warn the villagers, exhibiting Stockholm Syndrome.

Question: Based on this passage, who was the first person infected in contagion?
Beth Emhoff