Updated: Share Article AAA Corporation marshals challan a driver in Bengaluru on Friday for not wearing mask. | Photo Credit: MURALI KUMAR K. Three new COVID-19 clusters, all in the Yelahanka zone, with a total of 19 positive cases were detected in Bengaluru on Friday. This takes the overall number of such groups to six over the past two weeks. Two of the clusters were detected in educational institutions: five cases at Agragami College and nine students tested positive at Sambhram Academy of Management Studies. The third one, with five cases, is in a residential complex, Purva Venezia apartments. BBMP Commissioner N. Manjunath Prasad said the detection of new cases was the result of elaborate testing taken up across educational institutions where students from neighbouring states, especially Kerala and Maharashtra, study. Testing has been intensified, especially in nursing colleges, where most of the students hail from Kerala. As per conservative estimates, there were nearly 18,000 nursing students in different colleges in the city.