Prime Minister Narendra Modi has wished a "speedy recovery" to his Pakistan counterpart Imran Khan, who tested positive for the coronavirus on Saturday. "Best wishes to Prime Minister Imran Khan for a speedy recovery from COVID-19," he tweeted.
Pakistan's top health official, Faisal Sultan, tweeted that Mr Khan was in self-isolation at home after testing positive for the virus.
Mr Khan, 68, had been holding frequent meetings lately, without wearing mask on some occasions, news agency Reuters.
He was vaccinated against the virus on Thursday.
Most of the vaccines against the virus take weeks to generate immune response.
Mr Khan had talked about good relations with India as soon as he became the Prime Minister of Pakistan in 2018. New Delhi, however, has been calling him out over his inability to rein in cross-border terrorism originating from Pakistan.
Mr Khan's relationship with the ruling BJP and Prime Minister Narendra Modi has also been frosty, especially after the Pulwama terror attack in which 40 Indian soldiers had lost their lives in the line of duty.
Mr Khan regularly attacks PM Modi on Twitter over a host of issues, including the revocation of Jammu and Kashmir's special status and the former state's bifurcation into two Union Territories.
India maintains that its decision in Kashmir is an internal matter.
Pakistan's coronavirus count has passed over 6.15 lakh, including 13,700 deaths. Most of the new cases are coming from Pakistan's Punjab province.
The cash-strapped country has been mostly relying on China for health supplies and vaccines.
It will soon get made-in-India coronavirus vaccines under the United Global Alliance for Vaccines and Immunization or GAVI, a public-private global health partnership to increase access to immunisation in poor countries.
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