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Image: Tina Tiller
Image: Tina Tiller

ScienceNovember 26, 2021

Siouxsie Wiles: How to care for yourself and others with Covid-19 at home

Image: Tina Tiller
Image: Tina Tiller

Many Covid patients will recover at home this summer. Here’s what to do if you test positive.

Moving away from the elimination strategy means we now have more people with Covid-19 than can be cared for within our managed isolation and quarantine system. Like many countries around the world that means people with the virus need to be isolated and cared for at home. This has been happening for a little while during our current delta outbreak.

Yesterday the government announced that people who test positive for Covid-19, along with their household contact will now most likely be isolating at home for ten days. It also announced a plan to better support people who have to isolate at home and a $300 million boost to Pharmac to buy new medicines to treat Covid-19.

Going forward, the government’s “Care in the Community” approach will see people who test positive for Covid-19 contacted by a healthcare provider within 24 hours. This will be to discuss what they, and their household contacts, will need to isolate at home. Presumably this will cover whether they have any medical needs and what their housing situation is. People will also be allocated someone who will be responsible for looking out for their health and wellbeing needs and checking in with them regularly. I hope this will be a local healthcare provider, like a GP, who’ll be most likely to know what those needs really are. The government says people will also be provided with a support pack within 48 hours though there weren’t many details of what this would include.

Time to put an isolation plan together

Caring for yourself or someone else with Covid at home involves two important things: making sure all of your/their needs are met and preventing anyone else from getting infected. Back in March last year I shared my pandemic preparedness plan with you all. I think what we all need now is an isolation plan and so below are some of my things to think about. The Unite Against Covid-19 website also has a really good Readiness Checklist to help you plan and prepare. There is even a sign for you to print out that you can put on your door to warn others that you are isolating.

The other people who’ve put together a list are those who have had Covid-19/long Covid. This list is crowdsourced so contains a few things that will only provide some relief via the power of the placebo effect.

I know this is a bit macabre, but we know Covid-19 is a serious illness, especially for the unvaccinated. Is your will up to date? Does your family know your wishes for end-of-life care? Do you know theirs?

Pick an “isolation pal”

You’re going to need an “isolation pal”, especially if you live by yourself. This will be the person you keep in daily contact with. Make sure they have your emergency contacts. Make a plan for how you will deliver food and medicines to each other if needed. If either of you gets sick, check in twice a day. Make sure you have plans for the care of children, pets, and anyone who may need extra help should you become unwell. Also have instructions handy for how people can help with important things like paying bills, or household chores like taking care of plants.

What do you need in order to isolate?

Make sure you and your household are prepared for a period of self-isolation or quarantine lasting at least 10 days. Does the person who will do your shopping know what sort of things you like to eat? Are you able to start popping away some yummy, easy, and nutritious meals in the freezer? What about some treats? Do you have things like tissues, sanitary products, and contraception? How about pet food and litter? Don’t forget things to keep you entertained. Think also about what you might need work-wise, if you need to isolate and work from home.

How will people isolate from each other in your household?

The main way people get infected is living with someone with Covid-19. This virus is airborne so spreads through the air and people are infectious for a few days before they develop symptoms. If someone in your house tests positive then you have probably already been exposed, but you may not have been infected yet, especially if you are vaccinated.

Are people able to isolate away from each other?

What this means in practice is keeping the person with Covid away from all other family members and pets. Is there somewhere separate in the house they can stay? Keep the whole place well ventilated by opening doors and windows to minimise contaminated air from lingering and exposing others. It would also help if the person with Covid wore a mask to reduce the amount of virus they were shedding. In the past, a lot of emphasis has been placed on disinfecting everything and maybe even wearing gloves. Those are precautions that work well for droplet spread infections rather than airborne infections so I’m not sure how useful they really are. I wouldn’t bother with gloves. Regularly washing hands is far more effective. As for disinfecting every surface? I think opening the windows is way more important.

If you get Covid, what symptoms should you expect?

The data from the UK Covid-19 Infection survey gives us a good idea. They found that about half of people infected with delta experienced symptoms and the most common symptoms were cough, fatigue, headache, sore throat, fever, loss of taste or smell, and aches and pains. You may just get one of those symptoms, or a combination. About four out of every ten people experience a cough and/or fatigue. A little over one in ten experienced gastrointestinal symptoms like abdominal pain, nausea, vomiting, or diarrhoea.

I haven’t been able to find much about how severe you can expect the symptoms to be, although that sort of thing is always subjective. Man flu, I’m looking at you! One of the big mistakes made right at the start of the pandemic was health officials classifying many people as experiencing what they called “mild” disease. What they really meant was that most people didn’t need to go to hospital. But that didn’t mean people had what you and I would probably call a mild illness. Plenty of people feel pretty knocked about by Covid, so prepare to feel quite unwell. If you’ve ever had the actual flu, think that level of unwell. We also know that the older you are, the more likely you will be to have a tougher time. The guidance from the US says most people will start feeling better after a week.

It’s worth noting that the UK survey was done under the background of a high rate of vaccination so the chances of people developing symptoms will be higher if they are unvaccinated or if it’s been less than two weeks since they received their second vaccine dose. If you are fully vaccinated, you are less likely to experience symptoms and if you do you will probably experience fewer symptoms.

Monitoring and relieving symptoms

If you do experience symptoms, you’ll likely need things to help monitor and relieve them. In the meantime, I suggest you pop into your local pharmacy and talk to your pharmacist about what they recommend for treating the symptoms on the list. Let them know if you are taking other medicines. If they recommend any homeopathic products or ear candles, I’d recommend finding yourself another pharmacy or pharmacist.

One of the things you might have heard mentioned a lot is the pulse oximeter. This is a little device that you pop on your finger which monitors your oxygen saturation levels. A healthy person will normally have readings in the 94-100% range. If you have a mild respiratory illness, readings can drop to 90%. Below this level is when someone will likely need to be given extra oxygen. If your levels start dropping and you’ve been given a number to call, call it. If you don’t know who to call, get in touch with your GP or other health provider, or Healthline.

In saying that, normal oxygen saturation levels can vary from person to person depending on their health condition, normal respiratory rate, the amount of oxygen in the air, and the type of activity they are performing. And like many other devices, they were designed with white people in mind so may not work as well for people with darker skin. In other words, if you are feeling breathless but your pulse oximeter suggests you are fine, don’t put off calling for advice.

If you have a fever, a thermometer will be helpful to keep an eye on your temperature. Normal body temperature is around 37 degrees Celsius. A mild fever is 38 to 38.9 and a high fever is above 39. Above 40 is a very high fever. Drink plenty of fluids, preferably water, and wear light clothes. Putting cool cloths on your face, arms, and neck should help a little. Take paracetamol and ibuprofen every four to six hours but make sure you keep track of how many you are taking. Generic versions of these medicines are fine, unless you want to go for the faster acting versions, but they’ll be much more expensive. If you are taking ibuprofen, make sure you keep hydrated so as not to cause problems for your kidneys.

In summary: it’s time to make an isolation plan. You don’t even need to start from scratch. Test it out. Check in with your family, friends, and neighbours. Does everyone have a plan? Will they be able to get what they need? Watching out for each other is how we’ve gotten through the pandemic so far and its how we’ll get through the next phase too.

Keep going!
An artist’s impression of the Dart mission (Image: Nasa/Johns Hopkins Applied Physics Lab; additional design by Tina Tiller)
An artist’s impression of the Dart mission (Image: Nasa/Johns Hopkins Applied Physics Lab; additional design by Tina Tiller)

ScienceNovember 24, 2021

Nasa is launching a bumper car into space to bounce away a death rock

An artist’s impression of the Dart mission (Image: Nasa/Johns Hopkins Applied Physics Lab; additional design by Tina Tiller)
An artist’s impression of the Dart mission (Image: Nasa/Johns Hopkins Applied Physics Lab; additional design by Tina Tiller)

Nasa’s about to launch a test spacecraft to fight off Earth-destroying asteroids. Mirjam Guesgen explains.

What’s all this then?

Nasa’s testing whether it can use a spaceship to change the course of an asteroid. If the test works, the agency might have a new way to deflect potentially dangerous asteroids headed for Earth.

In other words it’s launching a bumper car into space to bounce away a death rock.

Wait, there’s an Armageddon-style asteroid coming for us all?!

No. 

This is just a test of the technique, called the kinetic impactor technique, and the asteroid Nasa is targeting isn’t a threat to Earth. 

And technically, it’s not even an asteroid they’re trying to hit. It’s the asteroid’s mini-moon. 

The rock is called 65803 Didymos and its moonlet is called Dimorphos. Both are closely monitored by space agencies on Earth.

When will this happen?

The rocket will be launched tonight (Wednesday, November 24) at around 7:20pm New Zealand time (1.20am EST) but the spacecraft will need some time to travel to the asteroid and won’t boop Dimorphos until late September 2022. 

This sounds a little Jerry Bruckheimer-y?

Just because there are Hollywood movies about it doesn’t mean it should be dismissed, says Guglielmo Aglietti, director of the Space Institute, Te Pūnaha Ātea. 

He explains that although extinction-level asteroids hitting the Earth is a rare occurrence, it’s a real possibility that we need to be prepared for. 

“Nobody knows when it will happen next, whether we’re talking a few hundred years or a few thousand years or maybe even a hundred thousand years, but it’s one of those things that could happen. It’s good to be prepared… it’s not just a theoretical risk, it’s a real risk.”

We need to test this tech now so we’re ready for the real thing later on. 

The Dart spacecraft will be launched from a SpaceX Falcon 9 rocket (Image: Nasa/Johns Hopkins Applied Physics Lab)

So how does this work?

The mission is called the Double Asteroid Redirection Test (Dart) and it’ll involve launching the Dart spacecraft from a SpaceX Falcon 9 rocket. The spacecraft will then guide itself to the moonlet using an onboard camera and high-tech autonomous navigation software. 

The Dart craft will hit less with a bump and more with a shove. It’ll be travelling at around 6.6km/s, or 23,760km/h, on impact. That’s about the speed of a ballistic missile. 

That shove, although it sounds forceful, will only change the orbit of the moonlet by a fraction of a percent and the time it takes for the moonlet to orbit the asteroid by a couple of minutes. “If you try and deflect these objects when they’re very far away, then even a little deflection will be good enough to move it out of the way of the Earth,” says Aglietti. 

The Nasa team here on Earth will keep a watchful eye over the whole thing using telescopes and planetary radar (radio signals). 

Is it hard to do?

Ah… yeah. 

The collision will happen when the asteroid and its moonlet are about 11 million kilometres away from Earth, or about 28 times as far as us to our moon. So the spacecraft not only has to ram into the object with some force, it has to hit it in the right spot and at the right angle.

“The direction of the push is important. You don’t want to make it worse,” says Aglietti. That is, you don’t want to steer it closer to Earth. 

The success of the mission comes down to some cool tech, for sure, but also careful monitoring and prediction of where the asteroid will be, he explains. “We monitor most of the bodies we can see. If we improve our capability to detect these objects and to predict what their path is going to be with higher precision, then that’s good.”

What else could we do to combat potentially Earth-destroying asteroids?

There are a couple of other options to get rid of pesky asteroids, each with their own pros and cons:

The “easiest” would be to blow it up with a big missile, but then it’ll likely shatter into lots of smaller pieces that could still hit Earth. 

Or you could land a ship on the asteroid and use the ship’s thrusters to move the asteroid out of the way. Essentially strapping a little jetpack to the asteroid and moving it.

Last year, Nasa’s Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (Osiris-Rex) craft successfully touched the Bennu asteroid but that took a great amount of planning and careful manoeuvring. So it’s a slow process and the asteroid would have to be far enough away that there would be time to change its course. 

Or you could go full Star Wars and use a series of lasers in space to blow up the asteroid when it’s far enough away from Earth that those bits won’t hit us. Those lasers could also slice a chunk off the asteroid that would collide with the rest of the rock and alter its course. Two scientists in California have proposed this, calling their potential device Directed Energy Solar Targeting of Asteroids and exploRation, or De-Star. 

OK, sounds chill, can I watch the launch?

Yup. Blast that Aerosmith circa 1998 and tune in either to Nasa Television, Nasa’s YouTube channel or using the Nasa app.

If you really want to be in the know, you can register to get information about the launch schedule. And for the super-keen, you take part in the Planetary Defenders campaign and earn yourself a snazzy certificate.