A senior scientist at the Indian Council of Medical Research (ICMR) has tested positive for novel coronavirus following which the entire ICMR building is being sanitised, sources said.
The scientist, who is from Mumbai, had come to Delhi few days ago and tested positive for the virus on Sunday morning.
The scientist is from the National Institute for Research in Reproductive health in ICMR, Mumbai.
The ICMR building will be sanitised and fumigated for two days, a source said.
The scientist had last week attended a meeting in which ICMR Director-General Dr Balram Bhargava, among others, was present.
A message from the administration was sent to a section of employees, urging them to work from home as the ICMR headquarters is under fumigation, the sources said.
"Only the COVID-19 core team may come, if absolutely necessary. Others should work from home only," the message said.
Meanwhile, the death toll due to COVID-19 rose to 5,394 and the number of cases climbed to 1,90,535 in the country, which registered biggest single-day spikes of 230 deaths and 8,392 cases till Monday 8 am, according to the Union Health Ministry.
India is now seventh among the nations worst hit by the COVID-19 pandemic after the US, Brazil, Russia, the UK, Spain and Italy, according to the WHO coronavirus tracker.
The number of active COVID-19 cases stands at 93,322 while 91,818 people have recovered and one patient has migrated, it said.
"Thus, around 48.19 per cent patients have recovered so far," a senior health ministry official said. The total number of confirmed cases includes foreigners.
Of the 230 deaths reported since Sunday morning, 89 are in Maharashtra, 57 in Delhi, 31 in Gujarat, 13 in Tamil Nadu, 12 in Uttar Pradesh, eight in West Bengal, seven in Madhya Pradesh, five in Telangana, three in Karnataka, two in Andhra Pradesh and one each in Bihar, Punjab and Rajasthan.
Out of the total 5,394 fatalities, Maharashtra tops tally with 2,286 deaths followed by Gujarat with 1,038 deaths, Delhi with 473, Madhya Pradesh with 350, West Bengal with 317, Uttar Pradesh with 213, Rajasthan with 194, Tamil Nadu with 173, Telangana with 82 and Andhra Pradesh with 62 deaths. The death toll has reached 51 in Karnataka and 45 in Punjab.
Jammu and Kashmir has reported 28 fatalities due to the disease, Bihar has 21, Haryana has 20 deaths, Kerala has nine while Odisha has reported seven deaths so far.
Himachal Pradesh, Jharkhand and Uttarakhand have registered five COVID-19 fatalities each while Chandigarh and Assam have recorded four deaths each so far. Meghalaya and Chhattisgarh have reported one COVID-19 fatality each, according to ministry data.
More than 70 per cent of the deaths are due to comorbidities, according to the health ministry website.