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Australia Asymptomatic coronavirus cases account for 15pc of COVID-19 infections: study

00:21  04 june  2020
00:21  04 june  2020 Source:   abc.net.au

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COVID - 19 Coronavirus Pandemic. Reported Cases and Deaths by Country, Territory, or Conveyance. The coronavirus COVID - 19 is affecting 213 countries and territories around the world and 2 international Highlighted in green. = all cases have recovered from the infection .

Symptomatic transmission By way of definition, a symptomatic COVID - 19 case is a case who has COVID - 19 could transmit the virus before significant symptoms develop. It is important to recognize Confirmed case A person with laboratory confirmation of COVID - 19 infection , irrespective of clinical

a person holding a dog: John and Bev Kable were happy to be reunited with their dog, Jock, after weeks in isolation. (ABC News: Brendan Esposito) © Provided by ABC Health John and Bev Kable were happy to be reunited with their dog, Jock, after weeks in isolation. (ABC News: Brendan Esposito) Bev and John Kable's bucket list cruise to the Antarctic didn't go the way they planned, but it could have been much worse.

The Sydney grandparents' sightseeing was cut short and the ship stranded off the coast of Uruguay after a crew member became unwell in March.

Everyone on board was tested for coronavirus, including the couple.

John Kable was slightly concerned as he was in his late 70s, a high-risk age group.

"I've always had a little bit of a weak chest but I didn't have any symptoms, so I guess I wasn't overly worried," he said.

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COVID - 19 Coronavirus / Cases . See also: How to interpret the 15,152 (+600%) surge in new cases of February 12. By removing deaths and recoveries from total cases , we get "currently infected cases " or "active cases " ( cases still awaiting for an outcome).

Case classifications are based on WHO case definitions for COVID - 19 . § Transmission classification is based on WHO analysis of available official data and may be subject to reclassification as additional data become available. Countries/territories/areas experiencing multiple types of transmission are

They said they both felt perfectly healthy, so the couple was stunned to learn they both had COVID-19.

"I thought, how can that be?" Mrs Kable said.

"We hadn't had a thing wrong with us, nothing."

Passengers on the ship were already in lockdown.

But the Kables were regular travellers and weren't fazed by the diagnosis.

"Everything's an experience, isn't it?" Mrs Kable said. "We weren't feeling bad, so why cry now? We were quite happy."

Married for more than 50 years, the couple spent two-and-a-half weeks in their cabin.

"We managed the isolation pretty well, really," Mr Kable said.

"Reading our iPads or books or watching a bit of TV or just pottering around doing a little bit of marching up and down in the cabin."

The couple spent another two weeks in hotel quarantine in Melbourne before they tested negative to coronavirus and were allowed to return home.

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Coronavirus disease 2019 ( COVID - 19 ). Situation Report – 38. 1) Developing a WHO network of 15 COVID - 19 reference laboratories with demonstrated expertise in the molecular Table 1. Confirmed and suspected cases of COVID - 19 acute respiratory disease reported by provinces, regions and

Symptomatic cases of COVID - 19 are causing the majority of transmissionFootnote 1; however many people with COVID - 19 have only Asymptomatic and presymptomatic transmission of COVID - 19 is occurring; however, it remains unclear if it is a major driver of transmission.Footnote 2, Footnote 3

COVID-19 symptoms never develop for some

Researchers now believe about 15 per cent of people who contract COVID-19 will never show any symptoms, like the Kables.

Bond University medical professor Paul Glasziou, along with colleagues from the universities of Sydney and NSW, compared data from nine international studies to determine what proportion of people with COVID-19 were likely to be asymptomatic.

"The concern has been that there may be some people without symptoms but [who] are infectious and are spreading it without knowing it," Professor Glasziou said.

Some studies had previously suggested almost half of people with COVID-19 didn't show symptoms, but the review by the Australian team found the rate was much lower.

"About one in six or one in seven will not have any symptoms for the whole of the illness," Professor Glasziou said.

Fortunately, the scientists also found people who did not have symptoms were about a third less likely to spread the disease.

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Study Protocol The First Few COVID - 19 cases and contacts transmission investigation protocol presentation of COVID - 19 infection and course of associated disease • secondary infection rate (SIR) and asymptomatic infections • To characterize serologic response following confirmed COVID - 19

WHO COVID - 19 Situation Reports present official counts of confirmed COVID - 19 cases , thus o COVID - 19 Operational Planning Guidelines and COVID - 19 Partners Platform to support country Confirmed case A person with laboratory confirmation of COVID - 19 infection , irrespective of clinical

"The reason for that is you're not sick as long, and also you're not doing things like coughing or sneezing," he said.

'A very challenging infection'

The researchers looked at what happened to more than 20,000 people in six countries, including China, the US and Italy.

Professor Glasziou said the results confirmed testing and contact tracing were vital for slowing the spread of COVID-19.

"The better our isolation, testing and quarantining processes are at picking up those asymptomatic or mild people, the less restrictions we will need."

UNSW biosecurity professor Raina MacIntyre said COVID-19 was "a very challenging infection to control because you can't identify who is potentially infectious".

"You go to a restaurant, you go to a gym, you go to a protest, you don't know whether the person next to you is infected or not, and they may not know either."

Professor MacIntyre said high-risk groups such as nursing home residents, prisoners and frontline health workers should be tested as soon as there was an outbreak — regardless of whether they had symptoms — to prevent a resurgence of COVID-19.

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Coronavirus Incubation Period: Last updated: March 12, 15:00 GMT. 2-14 days represents the current official estimated range for the novel coronavirus COVID - 19 . In addition, a case with an incubation period of 19 days was observed in a JAMA study of 5 cases published on Feb.

Notably, the COVID - 19 infection rarely seems to cause a runny nose, sneezing, or sore throat (these symptoms have been observed in only about 5 Based on all 72,314 cases of COVID - 19 confirmed, suspected, and asymptomatic cases in China as of February 11, a paper by the Chinese CCDC

High risk of 'presymptomatic' spread

People without symptoms may also be in the 'presymptomatic' stage of COVID-19, before symptoms develop.

"The highest amount of infectiousness that you have is in the two days before you develop symptoms," Professor MacIntyre said.

The findings of the study, and another study commissioned by the World Health Organization and published in The Lancet medical journal, reinforce the importance of physical distancing.

Analysis from previous studies involving almost 8,000 people suggested staying between 1 and 2 metres from an infected person reduced the risk of infection to 3 per cent.

But being less than a metre from an infected person increased the transmission risk to 13 per cent.

Mr and Mrs Kable said while the experience had not put them off travelling, they were wary of the silent spread of the virus.

"I say to everybody that I speak to that if you don't have symptoms … you don't know, the person next to you could still have the virus," Mrs Kable said.

"So beware, because it's so invisible, it's so dangerous."

Click here for up-to-date coverage of the COVID-19 crisis on the Microsoft News app — available on Windows 10, iOS and Android

WA's hotel quarantine prevents 120 COVID-19 cases entering community .
The cases were picked up between March 27 and June 9, when the returned international travellers were forced to isolate for 14 days within a Perth hotel room, or Rottnest Island unit.The cases were picked up in the ten weeks between March 27 and June 9, when the returned international travellers were forced to isolate for 14 days within a Perth hotel room or Rottnest Island unit.

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