Patient Zero

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Patient Zero
Gabriel Gray, Chandra Suresh's supposed Patient Zero
First mentioned:	Genesis

In medicine, Patient Zero (also called the "index case") refers to the original source of an outbreak of a contagious illness within a population (that is, the origin of the outbreak from whom all other infections are ultimately derived) or to the most significant case within the population.

In fact, Chandra had already assembled a list of identified evolved humans, and Sylar, then known as Gabriel Gray, was the first he chose to contact. His reasons for choosing Gray as his first subject are unknown.

About

Chapter — 1 : Genesis

Chandra Suresh told his son Mohinder 2-days ago from Chapter-1 that he believed he was close to discovering the "Patient Zero" for his theories about new human evolutionary traits, and has tracked him down to Queens, New York.

Whether Chandra was successful in finding Patient Zero or Not, only proves that he still hasn't Patient Zero two days before his death.

Chapter — 3 : One Giant Leap

Eden discovers Chandra's Notebook hidden in Chandra's Laptop after Mohinder threw it across the apartment, then discovered Sylar's apartment's address, which is in Queens and is a Strong possibility of being Patient Zero.

Chapter — 9 : Homecomming

Mohinder was able to unlock his fathers List and Felipe Acerra is on top of the List, and is Deceased; could be Patient Zero.

Chapter — 10 : Six Month ago

Neither Chandra nor Mohinder has never mentioned who is Patient Zero. Since Chandra already met Gabriel Gray around Six Months Ago, and Chandra was still looking for Patent Zero in Genesis, only proves that Sylar is NOT Patient Zero.

Notes

• Chandra's actions in Six Months Ago and the fact that he had already identified many other potential evolved humans indicate that it's quite likely that Sylar was merely the first evolved human he contacted in New York. If by "Patient Zero" Chandra merely meant that Sylar was his first confirmed case, then he is using the term in quite a different sense than it was intended.
• It is possible that his use of the term "Patient Zero" might have some greater significance. Typically, referring to someone as "Patient Zero" would imply that they are the earliest case or the case from which other cases developed. Given that there are people on the list who are quite likely older than Sylar, it's unlikley that Suresh meant that Sylar was the first individual to develop powers or was the earliest-born individual with powers. However, it's still possible, though unlikely, that Chandra believed Sylar was pathologically responsible for others developing their powers.