Reports said Kumar was feeling unwell for the last couple of days and also had a mild fever. He got himself tested and the results came on Tuesday. He will remain in home quarantine until he tests negative.
Kumar's office was at the first-floor section of South Block, which is being thoroughly cleaned.
Nothing is being taken frivolously, officials in the know said.
At least 35 officials were sent to home quarantine after the report arrived. According to HT, the Chief of Defense Staff, General Bipin Rawat, and tri-service chiefs may not have come in his direct contact in the last four days.
Defense Minister Rajnath Singh didn't attend office on Wednesday, though he is discharging his duties like earlier.
Kumar actively spoke about government's initiatives
Kumar was active on social media and till June 1, was telling people about government initiatives in the battle against coronavirus. Meanwhile, a joint secretary at Law Ministry reportedly caught the infection. The driver of a joint secretary at the Culture Ministry also tested positive.