indore district health authorities have now changed their strategy of tracing contacts of positive persons six months after covid outbreakearlier health workers would find source of infection of a covid positive case by making a chain in scientific way epidemiological linkagesnow only family members and close contacts of a positive case are traced under the same strategy the changes have taken place after city reopened health workers have changed the strategy because unlocking has made it difficult to trace original source of infection said dr anil dongre district contact tracing inchargethe strategy was changed on the directions of higher authorities and district administration said dongrethe tracing of highrisk people among family members relatives close contacts like neighbours colony would continue said dr dongrethe easing of restrictions has led to more movement of people and also incubation period of virus is 510 days so it is becoming very difficult to trace every person in contact of a confirm positive case added dr dongreearlier in tracing of epidemiological linkages of positive cases of covid19 it was found that over 50 of positive cases are confirmed first contact of any positive cases