The deceased, 75-year-old Kalyani, was undergoing treatment at the Medical college here since May 16, official sources said.
"All the previous such epidemics were reported to be in clusters and historical evidence shows no simultaneous outbreaks", Vidya Menon, Clinical Professor at the Department of Medicine, Amrita Institute of Medical Sciences, Kochi, told IANS.
An official confirmed that even though the bats were carrying the Nipah virus, the reason behind their death was some other.
But blood and serum samples of bats collected from the affected areas turned negative and health experts are trying hard to pinpoint the main carriers of the virus.
The Union wellbeing service has said the infection has not spread past Kerala.
Telangana Director of Medical Education K. Ramesh Reddy said samples of two persons were sent to National Institute of Virology (NIV), Pune.
"However, people should take some precautionary measures like avoiding eating fruits bitten by bats and should eat pork only after boiling it properly", Phangcho said.
Also, tests are under way on two suspected patients from neighboring Karnataka state, both of whom became ill after contact with sick people in Kerala state, according to an earlier report. Some people can also experience atypical pneumonia and severe respiratory problems, including acute respiratory distress.
The central government has dispatched teams from the National Centre for Disease Control to the area to monitor the outbreak.
The team has fine-tuned the draft guidelines, case definitions, advisory for healthcare workers, information to the general public, advisories for sample collection and transportation accordingly. The contact tracing strategy adopted has also been successful.
The latest outbreak in India has so far affected mainly four districts of Kerala - Kozhikode, and its neigbouring districts of Malappuram, Kannur and Wayanad.
Human-to-human transmission has been noticed in infections of Nipah virus in India.
Officials on Friday ruled out the possibility of the virus spreading through fruit bats or pigs as lab reports turned out to be negative. The virus also spreads directly from human-to-human through close contact with people's secretions and excretions.
The primary treatment for humans is supportive care. NMCH superintendent Dr A P Singh said hospital staff would be provided protective equipment, such as individual gowns (impermeable), gloves, masks, goggles and shoe cover to avoid the risk of contracting the virus.