New Delhi, June 25 : Former Congress President Rahul Gandhi on Friday fired fresh salvos at the Narendra Modi government over the Delta Plus variant of Covid and asked why no testing on a large-scale was being done to stop its spread. "Question to Modi government on Delta plus variant, why there is no testing on large-scale to stop the spread of this variant. How effective are the vaccines and till when will full information be made available? What is the plan to control it in the third wave?" Rahul Gandhi said in a tweet in Hindi. His remarks came after several cases of Delta Plus strain -- a mutation of the Delta strain which drove the second wave of the virus in the country -- have been found in Kerala, Maharashtra and Madhya Pradesh. The parent Delta strain is highly infectious, however, not much is known yet about the Delta Plus. /IANS