US President Donald Trump said he will be cancelling upcoming appearances on the campaign trail ahead of a bitterly fought election.

This occurred after Trump said he had tested positive for Covid-19 and would quarantine inside the White House during his recovery, AFP reports.

The White House doctor said both Trump and First Lady Melania — who also tested positive — were well and that Trump would continue his presidential “duties without disruption”.

The two were tested after a close White House aide Hope Hicks had tested positive earlier in the day, with the bombshell news breaking as more restrictions loomed in Europe in an attempt to contain the deadly pandemic.

The most popular topic was “miracle cures” that appeared in 295,351 articles. The authors found comments by Trump drove major spikes in that theme.

In India, meanwhile, new research suggested that a small group of super-spreaders was responsible for almost two-thirds of coronavirus cases in the world’s second-most populous nation.

The study, published in the journal Science, found that eight percent of all people carrying the virus were responsible for 60 percent of new infections.