NEW DELHI: The government has quarantined over 25,500 Tablighi Jamaat members and their contacts across the country and sealed five villages in Haryana where some “foreign members” of this Islamic organisation had stayed. Residents of these villages have also been placed under quarantine, the government said on Monday.Home ministry joint secretary Punya Salila Srivatava said a “mega operation” to identify members of Tablighi Jamaat and their contacts was carried out by the Centre along with state governments across the country.She said 1,750 foreign-based members of the Jamaat, out of the total 2,083, have been blacklisted till now by the government.The Centre on Monday said 4,067 confirmed coronavirus positive cases were reported of which 1,445 are related to the Tablighi Jamaat congregation held in mid-March in Delhi’s Nizamuddin area.The congregation, in the middle of the Covid-19 outbreak and then many of its members travelling to several parts of the country, contributed significantly in spreading the infection even as the government announced stringent measures like lockdown to contain the transmission.An analysis of health ministry shows that without Tablighi Jamaat-related cases, India's Covid-19 positive count would have doubled in 7.4 days, whereas it doubled in 4.1 days because several infected members of the Jamaat dispersed across the country, leading to the spread of the virus.Srivastava said Union home secretary Ajay Bhalla wrote to all the states and Union Territories on Monday, asking them to ensure that the supply chain of medical oxygen, critical for treatment of Covid-19 affected people, should go on smoothly and these directions should be "implemented strictly" while following norms of social distancing and proper hygiene.Meanwhile, states have already been advised to use funds under National Health Mission and State Disaster Relief Fund to undertake all activities related with creation of quarantine centres, dedicated Covid-19 hospitals and other medical equipment, treatment of patients and all other activities related with management of the pandemic. In addition, NHM has already sanctioned Rs 1100 crore to all states and Rs 3000 crore additional funds were released on Monday.