pandemic has mostly been on the development of vaccines, experts say medical essentials to administer them are also vital.Hindustan Syringes -- one of the world's largest makers of the item -- said it is increasing its output of auto-disable devices (which prevent re-use) from 700 million a year to one billion by 2021 to meet the expected demand."Even if 60 percent of the world's population is immunised, it would mean four to five billion syringes would be required," Hindustan Syringes managing director Rajiv Nath told AFP at their factory in northern Haryana state.There are currently more than 30 candidate vaccines being tested on humans, with governments hoping to deploy one as soon as possible with the coronavirus wrecking lives and.