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As the coronavirus pandemic stretches on, a small proportion of Australians infected accept now died, while nearly take either recovered, or are probable to recover over the next few weeks.

One thing many of us want to know is for how long people who accept SARS-CoV-2, the virus that causes COVID-19, are able to pass it on to someone else.

Let'due south look at what the science tells us so far.

How long does information technology take to get sick?

The "incubation flow" is the fourth dimension between being exposed to the virus and the onset of symptoms.

For COVID-nineteen, the incubation catamenia ranges from i to xiv days. Simply nearly people who develop COVID-19 symptoms practice so 4 to 6 days after exposure.

Baca juga: Coronavirus: how long does it have to go sick? How infectious is information technology? Will you always have a fever? COVID-nineteen basics explained

How long are you lot infectious?

The "infectious catamenia" ways the fourth dimension you're able to spread the virus to someone else.

For COVID-19, there is emerging evidence to propose the infectious period may first 1 to 3 days before you lot develop symptoms.

The most infectious flow is thought to be ane to iii days before symptoms start, and in the first 7 days after symptoms begin. Merely some people may remain infectious for longer.

Unremarkably reported symptoms for COVID-19 – such equally fever, cough and fatigue – normally last around 9 to 10 days but this tin be longer.

Why are some people infectious for longer?

Typically with viruses, the higher the viral load (the more virus circulating in the torso), the higher the adventure of transmission through known transmission pathways.

A study conducted in Hong Kong looking at viral load in 23 patients diagnosed with COVID-19 found higher viral loads in the first week of illness.

Another report from Mainland china looking at 76 hospitalised patients found that by 10 days later symptom onset, mild cases had cleared the virus. That is, no virus was detectable through testing.

However, severe cases have much higher viral loads and many continue to test positive across the 10 days after symptoms start.

So the more severe the illness and the higher the viral load, the longer you lot keep to shed the virus and are infectious.

Baca juga: How can I treat myself if I've got – or call up I've got – coronavirus?

When are you no longer infectious?

If someone has been symptom-free for 3 days and they adult their first symptoms more 10 days prior, they are no longer considered to be infectious.

Only nosotros're not certain whether people are infectious when they have recovered but the virus can still be detected in their bodies.

One report from Hong Kong found the virus could exist detected for 20 days or longer afterwards the initial onset of symptoms in i-tertiary of patients tested.

Another study from China plant found the virus in a patients' faecal samples v weeks afterward the commencement onset of symptoms.

But the detection of the virus doesn't necessarily mean the person is infectious. We need more studies with larger sample sizes to become to the bottom of this question.

Should y'all get tested once more before going back into the customs?

Due to a global shortage of coronavirus tests, the Commonwealth and state governments have strict criteria about who should be tested for COVID-19 and when.

Baca juga: Who can get tested for coronavirus?

People who take been self-quarantining, because they had contact with a confirmed case of COVID-19 and have completed their 14-solar day quarantine flow without developing symptoms, can return to the customs. There is no requirement to be tested prior to returning to the community. Information technology is, all the same, recommended they continue to exercise social distancing and good hygiene every bit a precaution.

The requirements are different for people who take been diagnosed with COVID-19.

At present, re-testing people who have experienced mild affliction, and accept recovered from COVID-19 is not recommended. A person is considered condom to return to the customs and discontinue self-isolation if they are no longer infectious. This means they adult their first symptoms more than x days prior and have not experienced any symptoms for at least 3 days (72 hours).

For people who have been hospitalised with more astringent affliction, the testing requirements before discharge are different. They volition have two swabs taken 24 hours apart to check if they take cleared the virus. If the swabs are both negative, they can exist discharged and don't crave further self-isolation.

If ane or both tests are positive but the person is well enough to get dwelling house, they must continue to self-isolate for at least ten days since they were discharged from hospital and they have not experienced any symptoms for at least iii days.

At that place are also unlike testing requirements for people working or living in loftier-risk settings. If yous work or live in a high-risk setting yous should consult with your health care provider on re-testing requirements.