Mike Pence and his wife Karen tested negative for coronavirus again on Sunday, making it the third negative result since Donald Trump revealed he had contracted coronavirus.

The vice-president is continuing to attend election campaign events as Trump's team aims to continue full steam head with others standing in for the president while he remains sick.

But Pence's activities are in contradiction with the quarantine guidelines issued by the Centers for Disease Control and Prevention that say anyone exposed to the virus should self-isolate for 14 days.

The vice-president was in contact with Trump on Tuesday at the White House when it is possible the president was infectious.

Pence is scheduled to debate Kamala Harris, the Democratic vice-presidential nominee, in Salt Lake City, Utah, on Wednesday.

BBC