Sero survey outcome positive, but not the time to take it easy Firstly, about 40 crore people are still vulnerable and the spatial distribution of the antibodies may not be even across the country, making a third wave a real possibility still. Share Via Email | A+A A- A medic collects blood samples for serological survey (File Photo | PTI) The result of the fourth serological survey by the Indian Council of Medical Research is the best piece of news since March 2020, when the Covid-19 pandemic began to take a heavy toll on the health and livelihood of its citizens. That nearly 68% of the population has antibodies means a large section is protected against the virus. But as ICMR chief Balram Bhargava warned, it is no cause for celebration and a reason to throw caution to the wind. There are three reasons why there is a need for continued vigilance.