Five members of an extended family — a nine-month-old girl, her six-year-old sister, their 27-year-old mother, and an 11-year-old boy and his 45-year-old mother — tested positive for Covid-19 on Friday, pushing up the total number of cases in Bengal from 10 to 15. Currently in an isolation facility in Nadia, all the patients are being brought to ID Hospital in Beliaghata The five returned to Tehatta on March 20 from Delhi. There, a group of 30 relatives, including the five, had met another relative who had returned from the UK on March 16. A local source said the group reached Sealdah station on March 20, from where they boarded another passenger train to Bethuadahari . From there, they reportedly took an auto home. “The five, who have tested positive, had all been in contact with a Covid-19 patient. So, the source is known,” said a health department official.