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New Delhi, May 17: Eight of the 10 most valued domestic firms suffered a combined erosion of Rs 1,37,311.31 crore in market valuation last week, with Reliance Industries (RIL) taking the biggest knock.

Only Bharti Airtel and ITC from the top-10 list managed to close the week with gains.

RIL's market cap plunged Rs 65,232.46 crore to Rs 9,24,855.56 crore.

The market valuation of HDFC Bank declined Rs 22,347.07 crore to Rs 4,87,083.88 crore and that of Hindustan Unilever Limited tanked Rs 13,192.26 crore to Rs 4,77,458.89 crore.

ICICI Bank's market cap dropped Rs 9,770.06 crore to Rs 2,08,900.79 crore.

Infosys witnessed a decline of Rs 9,518.84 crore in valuation to reach Rs 2,77,814.09 crore while that of HDFC tumbled Rs 9,370.38 crore to Rs 2,83,293.70 crore.

The m-cap of Kotak Mahindra Bank slipped by Rs 7,805.2 crore to Rs 2,25,327.22 crore.

Tata Consultancy Services' market valuation dipped Rs 75.04 crore to Rs 7,10,439 crore.

In contrast, Bharti Airtel added Rs 13,147.89 crore to its valuation to stand at Rs 3,02,292.43 crore.

ITC's valuation also rose by Rs 7,744.11 crore to Rs 2,02,330.13 crore.

In the ranking of top-10 firms, RIL retained the number one spot, followed by TCS, HDFC Bank, HUL, Airtel, HDFC, Infosys, Kotak Mahindra Bank, ICICI Bank and ITC.

During the last week, the Sensex declined 544.97 points or 1.72 per cent.

New Delhi, Apr 15: As the world grapples with coronavirus, researchers have found the presence of a different kind of coronavirus -- bat coronavirus (BtCoV) --in two bat species from Kerala, Himachal Pradesh, Puducherry and Tamil Nadu, according to a study by the Indian Council of Medical Research (ICMR).

There is no evidence or research to claim that these bat coronaviruses can cause disease in humans, said Dr Pragya D Yadav, Scientist at the National Institute of Virology (NIV), Pune and also the first author of study.

The study has been published in the Indian Journal of Medical Research,

Twenty-five bats of Rousettus and Pteropus species from Kerala, Himachal Pradesh, Puducherry and Tamil Nadu were found positive for BtCoV in Kerala, Himachal Pradesh, Puducherry and Tamil Nadu.

"These bat coronaviruses have no relation with SARS-CoV2 responsible for the COVID-19 pandemic," Yadav said, adding that Pteropus bat species were earlier found positive for Nipah virus in 2018 and 2019 in Kerala.

"Bats are considered to be the natural reservoir for many viruses, of which some are potential human pathogens. In India, an association of Pteropus medius bats with the Nipah virus was reported in the past. It is suspected that the recently emerged severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) also has its association with bats," the objective of the study titled 'Detection of coronaviruses in Pteropus and Rousettus species of bats from different states of India' stated.

"In the present scenario of changing demography and ecological manipulations, it is challenging to have checks on the encounters of bats with other animals and humans," the study stated, highlighting that the need for active and continuous surveillance remains crucial for outbreak alerts for bat-associated viral agents with epidemic potential, which would be helpful in timely interventions.

"Although CoVs in the subfamily coronavirinae do not usually produce clinical symptoms in their natural hosts (bats), accidental transmission of these viruses to humans and other animals may result in respiratory, enteric, hepatic or neurologic diseases of variable severity. It is still not understood as to why only certain CoVs can infect people," the study said.

The scientists stressed on the need of proactive surveillance of zoonotic infections in bats.

The detection and identification of such viruses from bats also recommends cross-sectional antibody surveys (human and domestic animals) in localities where the viruses have been detected.

Similarly, if the epidemiological situation demands, evidence-based surveillance should also be conducted, the study said while emphasing on the need of developing strong mechanisms for working jointly with various stakeholders such as wildlife, poultry, animal husbandry and human health departments.

"In conclusion, our study showed detection of bat CoVs in two species of Indian bats. Continuous active surveillance is required to identify the emerging novel viruses with epidemic potential," Dr Yadav said.

Elaborating on the study, Dr Yadav said throat and rectal swab samples of two bat species -- Rousettus and Pteropus -- from seven states were screened for the bat coronvirus during which the representative samples collected from Kerala, Himachal Pradesh, Puducherry and Tamil Nadu tested positive while those from Karnataka, Chandigarh, Punjab, Telengana, Gujarat and Odisha came out negative.

The reverse-transcription polymerase chain reaction (RT-PCR) tests and sequencing were used for the confirmation of the findings.

"This is an ongoing study to understand the prevalence of the Nipah virus in bats," she said.