BENGALURU : Around 27.3% of Karnataka’s over 7 crore population may have been exposed to the covid-19 virus, according to the findings of a sero survey carried out by the state government.According to the Karnataka government, the sero survey estimates that around 1.93 crore or 27.3% of the state’s population are either currently infected or already had the infection in the past, as of 16 September 2020.The same survey has found that this number is around 30% in Bengaluru, one of the worst affected regions in the country.“The whole idea of doing such a survey is to understand the prevalence of covid-19 in Karnataka," K.Sudhakar, Karnataka’s health minister said on Wednesday in Bengaluru.The survey was carried out on 15,624 persons in 290.