<span style="color: #222222;">Union Home Ministry has said that  door to door survey for COVID-19 in Delhi will be done first in containment zones on priority basis by 6th of July.<br />''<br />''The decision to extend the date has been taken as numbers of containment zones has increased to 435 in the city.<br />''<br />''The Ministry said, this will be followed by door to door testing in entire Delhi.</span><br />