It takes to 81 the number of cases in the country, which until this week had had just a handful of people with the virus.
The cases are spread throughout the country with Ontong Java and parts of Guadalcanal in lockdown.
The outbreak began with the illegal entry of a vessel from Papua New Guinea to Ontong Java last week.
That vessel delivered at least 23 cases of Covid-19.
The virus has since spread to Guadalcanal, prompting a lockdown in Honiara that is due to finish tomorrow morning.
