coronavirus vaccine has shown it to be safe and produce an antibody response, Minister for Health Greg Hunt told news agency Reuters on Friday.Drug firms are racing to develop effective treatments for the infection amid a surge in coronavirus cases that has infected 53,090,778, killed 1,299,400 people and battered the world's economy.Several candidates including ones produced by Pfizer and AstraZeneca are expected to imminently announce the results from final stage testing.Covid-19 vaccine updateEarlier this week, Pfizer said that its experimental coronavirus vaccine had been more than 90% effective based on initial trial results.Pfizer and German partner BioNTech SE have said no serious safety concerns were found so far and expect to seek.