THERE HAS BEEN a lot of talk about “flattening the curve” of Covid-19, but what does this actually mean?
As cases of the coronavirus increase day by day in Ireland and across the world, the number of cases has differed from country to country.
Countries like Italy saw a large spike in cases over a short period of time, whereas others, like South Korea, have had a much steadier increase over the past few months.
In an effort to spread out the number of diagnosed cases here, the Irish government has said it is trying to ‘flatten the curve’ of the epidemic.
What does this mean?
Flattening the curve of Covid-19 cases is about slowing the spread of transmission over a longer period of time through measures like social distancing, and closures of schools and workplaces.
If we picture this increase on a graph, the ‘curve’ refers to how the increase in transmissions can be visualised. Flattening the curve is about making this look less extreme.
It also means that there is less pressure on the health service as there isn’t as large a number of people being diagnosed at the same time.
Instead, things are spread out and the health service has more time to deal with and plan for cases.
This image from the US’s CDC shows how we can visualise ‘flattening the curve’:
“In a pandemic like this where the virus is pretty good at transmitting from person to person, we can have an exponential increase in the number of infected people and that can lead to a peak of epidemic that completely swamps the health service,” explained Dr Kim Roberts, leader of the virology research group in Trinity College Dublin.
Roberts said measures like social distancing are aimed to slow down this transmission.
“So we slow down how the virus spreads through the population and we reduce the size of that peak so that although overall the same number of people might become infected, it will be over a longer period of time and the health service won’t be overwhelmed.”
How is Ireland trying to flatten the curve?
Countries around the world have taken different approaches to tackling the spread of Covid-19.
In Ireland, schools, colleges and childcare facilities have been closed since last Friday. Pubs closed yesterday and workers who can continue their jobs from home have been advised to do so.
The government has informed people about social distancing and avoiding large groups in an effort to reduce a large surge in transmissions.
To limit the spread of the infection, Kim Roberts explained that reducing social interactions can have a huge influence on numbers.
“If we assume everyone who has Covid-19 will pass the virus on to an average of 2.5 people, and that transmission occurs on average five days after exposure, then within a month a single infected person can contribute to the infection of 244 people,” she said.
“If the transmission rate is reduced to 50% and each infected person instead passes the virus on to an average of 1.25 people then in a month, that infected person only contributes to the infection of four people.”
How can people help to reduce the transmission of Covid-19?
Chief Medical Officer Dr Tony Holohan gave a list of advice for people to follow yesterday.
His advice is:
Kim Roberts said people need to “be reasonable about risk and assessing the transmission risk”.
“Going to a supermarket to pick up essential supplies, if you wash your hands as soon as you get home and the shop isn’t full of people, that has a low transmission risk,” she explained.
However, going to a crowded bar and being close to a lot of people has a higher transmission risk.
“Similarly, meeting a friend in a park is going to be less of a transmission risk than going to somebody’s house or meeting in a cafe.
“It’s about thinking about what the risks are and trying to live as normally as possible, but change behaviours so that we minimise transmission risk.”
“We all need to realise that staying home saves lives… We also need to realise that we’re not trying to stop all transmission, we’re trying to slow it down.”
Dr Anthony Staines, a professor of health systems in Dublin City University, said people during this time should mind their neighbours and offer social supports, while maintaining social distancing.
“Contact tracing, testing and social isolation is what controls this pandemic and nothing else will control it,” he said.
Have these measures worked anywhere else in the past?
Yes. Countries such as China and South Korea have slowed down the spread of Covid-19 during this pandemic already.
In China for the past two months, thousands of new cases were diagnosed each day. There were 36 new cases confirmed in the country yesterday.
Past examples can be seen during the 1918 flu pandemic which killed around 50 million people worldwide.
In Philadelphia in the US, no social distancing measures were put in place and a parade with crowds of 200,000 people took place during the height of the pandemic. This led to a growth in thousands of infections very quickly.
In St Louis, however, parades were cancelled when the pandemic was at its peak.
A month after the parade, more than 10,000 people died from the flu in Philadelphia, according to the Centers for Disease Prevention and Control (CDC). In St Louis, the death toll did not rise above 700.
The CDC in the US cited this as a “deadly example” to show the benefits of cancelling mass gatherings and introducing social distancing during pandemics.
During the Severe acute respiratory syndrome (SARS) epidemic, Anthony Staines said “stringent quarantine measures were put in place and that worked in China and Canada”.
China was the worst affected country by this coronavirus, with over 5,000 confirmed cases.
In Canada, over 250 cases were confirmed, by far the highest number of any country outside Asia.
When will we know if social distancing measures are working to flatten the curve?
Tony Holohan said yesterday that the next seven days will be “vital” in the spread of the disease.
Anthony Staines said it will take “at least a week to 10 days” to see if the measures are working.
“What we see today is infections from between five and 10 days ago,” he explained.
What will happen even if we do nothing, at some point it will go up and then it will reduce no matter what we do.
However, by flattening the epidemic curve the numbers will be spread out over a longer period and the health service will be less overwhelmed.
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Massaging our minds for the unavoidable massive carbon tax hike to pay for the budget shortfall caused by Covid 19.
@Daniel Dunne: your mind is massaged enough – you know the greens are a left wing party? Which side are you really on!
@Brynþór Patrekursson: the Greens are not a left wing party. I am a former member. They will happily propose measures that wealthy people can afford, but which the rest of the citizens of the nation cannot.
The death toll and people infected so far from COVID19 is awful and with that I certainly think it’s been a awake up call not only for Ireland but the world. Sustainability globally is on tender hooks. But this is a good opertunity to look at new ideas of how we can better our environment and ourselves and how we go about our daily lives. If we can work from home and pop into the office once, twice a week surely it’s better in cutting down on time wasted in traffic and with that increases in air pollution. Public transport needs to be heavily invested, we all know that. It was a disgrace tearing up all those train tracks in the 50′s. The next 10 years are going to be really important in how we develop more sustainable living and ensuring that the environment is protected and our health.
@Dominic Foley: *tenterhooks
@Marty G: blame the autocorrect but thanks for that anyway
@Dominic Foley: Hear Hear!
@Dominic Foley: well said and agree 100%. I just have invested in an ebike myself, love it soooo much!
Massive carbon taxes coming no doubt. Especially if Greens are in government.
@Adam Conroy: it won’t matter who is in government, there will have to be tax increases regardless. There’s no magic money tree.
@Alan: there is a non-magic downsizing option though. Why should ordinary workers have their standards of living further reduced to support an inefficient state that doesn’t provide value for money or good services to the people expected to pay for it all?
Those of us with respiratory & immune illnesses, driven by diesel pollution, are indeed rejoicing #MCAS
@Gavin Tobin: Totally agree Gavin, be interesting to see figures from the Asthma Society of Ireland, would expect asthma attacks are lower.
@Carla Killeen: If asthma attacks are lower it might make the penny drop with the Department of Finance that a huge percentage of taxes raised on petrol & especially diesel actually goes towards paying for the health harm caused by burning said hydrocarbons and exhausting their filthy exhaust gasses at toddler level in our towns & cities.
I think that’s a legitimate single sentence :)
No Chemtrails, Gemma and the loons must be happy.
@paul kelly:
Give it a Rest.
Imagine if she was right, and you were wrong, Keep an open mind.
So we can reduce the carbon tax hoax.
I thought they said that it was the cows that were causing all the pollution. What did they do with them over the past two months? Put masks on their hindquarters!!
have your say