Blanket order for the elderly to self-isolate will be enforced in next 20 days as PM ratchets up efforts; Doctors are preparing to give isolated patients advice over video link and army hospitals will be used; The drastic measure is wrapped into a wider package of emergency powers to stem the spread of the virus; Troops will be deployed to guard hospitals and supermarkets and private hospital beds will be used; Business will be urged to serve national interest by overhauling production lines to make medical supplies