On Friday, the Health Department established the contacts of six of the nine patients, who had tested positive. However, it continues to trace the source of infection for the three others - all three residents of Chennai.
While one of them is a 25-year-old woman, a resident of Chennai who was working in a shopping mall in Velachery, the department is tracking the movements of two others - 73-year-old woman from Pammal and 39-year-old man from Anna Nagar in Chennai - to identify the source of infection.
The woman is admitted to the Rajiv Gandhi Government General Hospital, while the man is at Government Kilpauk Medical College Hospital.
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Official sources said that the woman had attended prayer in a church and has co-morbid condition, while the 39-year-old was a naturopathy student who had travelled in a train from Trichy and also attended a birthday party recently.
Officials said these three patients have non-identifiable sources. Tracking patient movements and their contacts is a challenging task. The department is tracing their movements to find out the sources or if they had a history of coming in contact with a positive patient. Till now, there have been cases in which the infection was transmitted within family members including a couple, mother-son, woman-grandson.