Outbreaks of norovirus have caused delays for some patients in Scotland's accident-and-emergency departments (A&E).

The latest figures show 93.4% of people were seen and either admitted, transferred or discharged within four hours in the week ending May 8, missing the Scottish Government's interim target of 95%.

A total of 90 patients (0.3%) spent more than eight hours in A&E, with just three people waiting for for more than 12 hours.

Four health boards - NHS Greater Glasgow, NHS Lothian, NHS Forth Valley and NHS Fife - missed the target, with the worst-performing site being Glasgow Royal Infirmary with a rating of 81.1%.

A Scottish Government spokeswoman said some larger hospitals had come under pressure during the week as a result of outbreaks of norovirus, which causes diarrhoea and vomiting.

She said: "As we have seen throughout the year, A&E performance will fluctuate from week to week and also from hospital to hospital as pressure on the service varies.

"During the week ending May 8, outbreaks of norovirus caused delays in some of the larger hospitals, including the Royal Infirmary Edinburgh, putting pressure on health services.

"Nationally, our core accident-and-emergency waiting times have remained better than elsewhere in the UK for the last 13 months of published data, from March 2015 to March 2016.

"However, we know there is still more to be done to retain and build on improved performance and cut waiting times even further."