Mohali, February 25 Mohali district has witnessed a 39.16 per cent increase in the Covid cases with the active cases crossing the 500-mark in the past one week. The district witnessed a sudden surge in Covid cases as 64 cases were reported on Wednesday against 39 cases on Tuesday, showing an increase of 50 per cent. Today, 50 cases surfaced in the district. Since February 1, only 15 to 20 cases were being reported, but there has been a constant increase in the Covid cases recently. This has become a cause of worry for the health authorities. On February 1, there were 551 active cases in the district. On February 17, the active cases had gone down to 360. However, within a week, the active cases have gone up to 501 — an increase of 39.16 per cent.