World Rugby's executive committee has approved optional law trials that provide member unions with measures to help reduce the risk of Covid-19 transmission.

Unions can apply to implement one or more of the temporary law amendments as domestic trials in line with the world governing body's return to play guidance.

A World Rugby statement said the trials "provide limits to scrum options with no scrum resets, limits for players joining rucks and mauls, time to play the ball at the base of scrums and rucks reduced from five to three seconds and only one movement permitted for a maul."

The trials, underpinned by World Health Organisation guidance, were considered by a specialist Law Review Group consisting of coaches, players, match officials, medics and law specialists following detailed analysis of 60 matches. 

The approach could reduce contact exposure for tight five players by more than 30%, reduce exposure at the ruck by up to 25% and reduce maul contact exposure by 50%.

World Rugby chairman Bill Beaumont said: "The health and well-being of the rugby family is paramount.

"We have extensively evaluated the perceived risk areas within the game in partnership with our unions. This has enabled an evidence-based assessment of risk areas and playing positions, which led us to develop optional temporary law amendments."

In addition to the on-field law trials, a number of hygiene measures are recommended for playing and training.

These include mandatory hand and face sanitisation pre- and post-match, regular sanitisation of the match ball before during and after matches, single-use water bottles, changing kit at half-time, prevention of huddles and celebrations, prevention of spitting and nose clearance.