South Australia's worst cluster to date has gone from bad to worse, with 17 cases now tied to the family outbreak.
Speaking to Adelaide's 5AA Radio this morning, South Australia's chief public health officer Dr Nicola Spurrier confirmed the Parafield cluster was growing at a rapid rate.
Hungry Jacks Port Adelaide has also been closed and is the latest venue to shut for deep cleaning.
Dr Spurrier described the outbreak as "very serious".