Health Minister Natasha Fyles says Wednesday's tally now stands at 778 and not the 492 originally recorded.
The minister says 95 people are in hospital across the Territory with four of those in intensive care.
She has also revealed the death of a man in Tennant Creek who tested positive for the virus.
However, she says health officials have indicated the man died of a cardiac arrest and is not being considered a COVID-19 death at this stage.
Ms Fyles said the government was comfortable with the level of hospitalisations but remained concerned at low regional testing rates.
"We've stabilised those case numbers over the past couple of weeks, and that's really important in flattening that curve," the minister said.
"But overall, our testing rates in central Australia are pretty low. They were low yesterday.
"So while we're reporting just a handful of cases in communities we really need people to come forward to be tested to remain confident that we are on top of things."
Ms Fyles said one area of concern was Laramba, 200 kilometres west of Alice Springs, where 17 cases were detected from just 25 tests.
More cases were also reported from the Alice Springs prison with the outbreak among inmates and staff rising by six to 128.
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