Two weeks after the death of three children in Mumbai following the administration different immunisation dosages, the committee formed by the state government and BMC health authorities has come out with a preliminary report on the cause of the deaths. According to the doctors in the committee, the deaths were not caused by defective vaccines. "It is not the fault of the vaccines, but again it is difficult to say unless we get the reports of the vaccine samples tests from the Kasauli laboratory,' said Dr Radha Aras, professor and head of preventive and social medicine department.