Finding associations between people movement and number of cases can inform us regarding the extent of infection spread and the effect of lockdown in curbing the virus. We mapped the overall mobility for each ward inside Chennai to its corresponding zone. We calculated the total number of mobile units dated from April 06 to May 01 from the Facebook mobility data and compared with the number of cases in Chennai during May 02 to May 15. We introduced an offset of two weeks in order to take into account the incubation period of SARS-CoV-2.
The data for zonal level breakup of COVID-19 cases for Chennai is retrieved from Greater Chennai Corporation's twitter handle (@chennaicorp)
The comparison shows that there is a huge overlap between the regions that show large amounts of movement and regions that are heavily affected by the virus.