Twitter is to censor content relating to Covid-19 with warning labels if it does not comply with the guidance of 'public health experts', in a move sure to be seen as the latest by big tech to suppress information on the global pandemic.

The company says the warnings will extend to anything deemed to be out of step with the advice of health authorities. The move is to provide users with "additional context," according to Public Policy Director Nick Pickles.

The warning messages will conceal the tweet from view (censor it) unless the user clicks through to it.

"These warnings will inform people that the information in the Tweet conflicts with public health experts' guidance before they view it," the company said in a blog post.

Tweets targeted by the warnings will include merely casting doubt on the need to practice social distancing or wear a mask, according to reports.

The company says it has a tiered system in place to determine how 'severe' the 'conspiracy theory' is.