Researchers chasing long Covid cures are eager to learn whether the drug can offer similar benefits to millions suffering from pain, fatigue and brain fog months after a coronavirus infection.

Dropping cannabis from Thailand's narcotics list has led to an explosion of recreational use.

The move comes as regulators around the world give the green light to treatments – particularly for high-risk groups – amid worries over the new Omicron variant.

The data, yet to be published in a peer-reviewed medical journal, shows that the companies' treatment, sotrovimab, is effective against all 37 identified mutations to date in the spike protein, according to GSK.

The drug, which has been undergoing final clinical trials to assess its safety and efficacy, failed its main goal to treat Covid-19 symptoms in exposed patients.