BMC commissioner Iqbal Chahal has said that vaccination works and civic data shows that 96% of the 1,900-odd patients on oxygen beds in Mumbai have not taken even a single dose of the Covid-19 vaccine. The BMC has decided that unlike the first and second waves where positivity was the benchmark to impose a lockdown or restrictions, in the third wave further curbs would be imposed only if there is a burden of high hospitalisation rate and steep rise in oxygen usage.