SRINAGAR : In the biggest single-day jump, 620 people, including two newborns, tested positive for COVID-19 in Jammu and Kashmir on Sunday, taking the union territory's tally to over 4,000, officials said.The Kashmir Valley reported 583 of the fresh cases, while 37 people tested positive for the disease in Jammu region, they said.Both the newborns, a one-day-old and another three-day-old, and their mothers were admitted to GB Pant Hospital here after they tested positive for the dreaded disease, the official said.With the fresh cases, the total number of COVID-19 patients in the union territory has gone up to 4,087-- 3,198 are in Kashmir and 889 in Jammu region.