"From 5th December, 848 cases [have been] reported, 332 discharges till 7th December. So far we know that it is non infective," Roy said.
According to the official, cases have so far been reported across the Eluru division, with "public panic" observed all over the district.
Central authorities will send an expert team to the area on Tuesday, the officer confirmed.
Roy also added that the new mysterious illness in southeastern India is not related to the ongoing coronavirus pandemic, and the authorities suspect that it might have been caused by water contamination.
"[We] suspect water contamination with heavy metals, organophosphate compounds, pesticide contamination," Roy said.
According to the official, the authorities are still trying to establish the cause of the illness that has affected several hundred people, analyzing cerebrospinal fluid, blood, serum, water, food, urine, vomitus, stool and vegetable samples.
The affected people have also had CT scans and reverse transcription-polymerase chain reaction (RT-PCR) tests for coronavirus.
"So far CT and RT-PCR reported negative for COVID-19. Hence there is no correlation between the two," the official added.
The district surveillance officer noted that the affected areas were in "psychological distress," and the government was seeking to manage the public panic via effective communication.