19.56 What do we know about the Coronavirus family of viruses?
Liam
So, we're going to move on now to sort of add another layer of detail. So, we want to ask you about the science behind the common cold and flu and the coronavirus family of viruses, I guess. Do you want to talk to us a little bit about that, and go into the science a little for us.
Josie
Yeah. Sure. So, I don't know if you've ever met a scientist before, but they are highly organized analytical type people. And they like to classify and sort things into orders.
So, this is true with viruses.
So, with a virus, they are generally classified or sorted into different types of families. And they sort them by like or similar characteristics and traits. This could be anything from shape, structure, genetic information, even down to what type of disease they could cause.
So, the coronavirus is a large family of viruses. So, in humans the coronavirus family tends to cause respiratory infections, and these can be relatively mild infections such as a common cold. But, then on the other end of the spectrum, there are more severe ones such as SARS, MERS, and more recently as we know COVID-19.
So, we've known about human corona viruses for a while, and they identified the first one in the 1960s, but more recently there have been at least six new human corona viruses identified since the early 2000s including SARS. So, SARS stands for severe acute respiratory syndrome. So, under an electron microscope, so an electron microscope is a really powerful microscope that allows us to see really small things.
So, corona viruses have this crown like appearance, and corona is actually Latin for crown. So, that's where the name originates from. The crown appearance is caused by spike proteins, or S proteins, that sort of protrude out of its surface. So, we know COVID-19 is related to other human corona viruses, such as the SARS and MERS that we've heard about before. And they share a similar genetic footprint, but they're not exactly the same.
Our scientists have been doing lots of genetic testing and genetic sequencing tests. So, the corona viruses have these S proteins or these spikes sticking out its surface, so to be able to enter a human cell, the spikes need to dock with a receptor on a human cell. So, they need to come together.
The one COVID-19 likes is a receptor called ACE2, so it's kind of like a doorway into our cells. These are particularly common in the lungs, so they're particular cells found in the lungs.
This docking - the spike and the receptor coming together - is a crucial step for the virus to enter into our cells. It's not technically a virus until this has happened.
So, once that happens, the virus will inject its genetic information into our cells, and the genetic information is essentially instructions on how to make clones of itself.
23.48 Flattening the curve - how can we stop the spread of Coronavirus?
Liam
Alright, Josie. So, thanks for that. We've talked about the science of cold and flu and the coronavirus family, as it were, a family of viruses. So, going to add another layer of detail here. We want to ask you about the virus in terms of how it's evolving. We talked offline about the spread, about contagion, and also about how the healthy body responds to the virus. So, do you want to talk to us about the flattening the curves, and the significance of that with this virus?
Josie
Yeah. Absolutely. So, we keep hearing the term flatten the curve. The curve is essentially a scientific model that predicts the effectiveness of different interventions to try and limit the spread of the virus. So, we need to look at how infectious COVID-19 is. So, by infectious we mean this is the number of people infected by each person infected. So, compared to the seasonal flu, approximately for one person who has the flu, they will then go onto infect a further 1.3 people. What we know about COVID-19 is that for every one person that has COVID-19, they will then go onto infect another two to 2.5 people.
Liam
And the significance of that is...
Josie
Just sheer numbers. So, it just spreads much more quickly.
Liam
And that's the reason for the lock downs, et cetera.
Josie
Yeah. For social isolation.
26.23 What is the impact of our immune system on the spread of Coronavirus?
Liam
All right. Okay. So, that's clear. So, I'm asking you to now more clearly explain this point that I got quite excited about when we first talked. And in my simple speak, it was this idea that what determines whether people will get seriously ill is something to do with their immune system and something to do with how their immune system responds. Can you sort of more properly explain that, and then what that would mean?
I mean these are only sort of assumptions based on things we're looking at, as we said to the listeners in the intro. We're not giving medical advice. We're not saying take these interpretations at face value. We're just looking at what we know today, and we're just trying to make sense of it. So, with that in mind, do you want to explain about the impact of the immune system, Josie?
Josie
Okay. So, the immune system is basically our body's own defense system. It's like our very own personal unique army we use to fight infections. So, within the immune system, it has lots of different components. So, there will be white blood cells. There'll be antibodies and lymph nodes. The immune system essentially is split into two lines of defense.
So, the first line of defense is what we call our innate immunity. It's our first line of defense against the virus, if you like. And this will be sort of things like the mucosal linings in our respiratory system, so you know the sticky mucus that you get in your nose. It will help to trap particles. Your body's innate immune system is absolutely incredible, and on its own can probably prevent most infections that you'll come across in your life. However, if there's a pathogen it can't destroy or it doesn't recognize, it will send a chemical signal to our second line of defense, so sort of a signal to say that they need a bit of backup.

So, the second line of defense we have, it's a bit more sophisticated, and we call it our adaptive immune system. The adaptive immune system is responsible for recognizing and remembering different types of viruses. Adaptive immunity gets its name because it can adapt and change. As you go through life and you're exposed to different types of microbes or pathogens, so if your innate defense can't fight them, your adaptive immunity is much more targeted and a bit more accurate. So, the adaptive immunity usually takes four to seven days to kick into action.
The other thing adaptive immunity does, which is really, really incredible is that it produces specific antibodies to fight an infection. And once it produces this antibody, it kind of stores it away in a memory bank. So, sometimes you get an illness only once in your life, and then you'll never get it again. It's because your body has produced this antibody, and it has this memory.
So, it can recall this memory, fire the antibody down to the pathogen, and deal with it quite effectively. So, you can see why keeping our immune system and our general health in really good condition is so important at the moment.
29.15 Adaptive immunity and antibodies - a big factor in why some people get sick from Coronavirus
Liam
Yeah. That just sounds amazing. Yeah. I mean I think... Yeah. Well, let's try and break that down for me, and for the listeners a bit. So, Josie, so are you saying that people who've gotten a weaker immune system are more susceptible to get ill? Are you saying that the main thing determining whether people get very ill from this virus is the condition of their immune system?
Josie
Yeah. That just sounds amazing. Yeah. I mean I think... Yeah. Well, let's try and break that down for me, and for the listeners a bit. So, Josie, so are you saying that people who've gotten a weaker immune system are more susceptible to get ill? Are you saying that the main thing determining whether people get very ill from this virus is the condition of their immune system?
Liam
Yeah. Okay. Well, let me explain what I think that means, as in what you've just said. Right?
Josie
Okay.
Liam
And we might leave it, or we... So, what stands out for... Okay. So, you've got two lines of defense. The first one is innate. The second one is adaptive. The adaptive is the interesting one that creates the antibodies.
Josie
Yep.
Liam
And the antibodies has got the memory, and the antibodies is the one that healthy people will have that will stop them getting sick, or could well stop them getting sick from this virus, which is why the vulnerable people with compromised immune systems are the ones we're protecting and stuff like that. So, to me... Is that it, or is that not it?
Josie
Well, kind of. If you think of the immune system as a whole system, anybody with an underlying healthcare condition, the majority of their immune system will be going towards supporting whatever that underlying health condition is. So, a big chunk of their immune system is already working hard on that underlying health condition. So, if you then go and put another pressure on it like COVID-19, for example, it's just not going to be as effective.
Liam
So, what I think you're saying is if someone doesn't have a serious health condition, and their immune system is working properly, it means that when the virus comes, that they've got all their power, all their energy, it's working at 90 to 100%, and they can sort of fight the attacker off relatively easily. If they've got some relatively serious health conditions, their immune system might be working at 50%, 60%, something like that because as you said, it's too busy dealing with another health condition. So, when the virus comes to them, they struggle to fight it off. That's the simple...
Josie
Yes. In very simple terms, yes.
Liam
It has to be simple for me, unfortunately. Brilliant. Brilliant. Okay. I think that kind of narrows that point because we're just trying to sort of draw out meaning from some of this science, quite honestly. And I know we're hacking it for simplicity, but it's to try to give some meaning, isn't it? Do you know what I mean?
Josie
Yeah.
Liam
Because it's not the place to get into too much detail. Otherwise, we lose the meaning in a nutshell. All right. So, let's move on, then, to... We can just do a quick summary there. So, we've got a good sense of who you are, Josie, in terms of your career story, your interests, and how you developed this sort of deep knowledge of your subject area both through practical work in the NHS employment sector and also studying it, studying the subjects formally. We've looked at the infection control and the chain of infection. We've looked at the science of cold and flue and the coronavirus family. We've looked at what we know about the virus today. We've looked at the levels of infection. You've also clearly explained the sort of relationship between the immune system and how that can have a bearing on whether people get very ill from this virus or they don't, and how that could be a significant factor in how this plays out with the population.
33.28 The key Infection Control Precautions
Liam
So, we want to kind of draw all of that together, all of that learning, all the sort of layers of information we've got there, and sort of end on a pretty practical note in terms of pulling all that stuff together and say, okay, so in terms of what we do know, based on your experience in infection control and knowledge about this virus, so what sort of tips or reminders would you give listeners in regards to protecting themselves from the virus?
Josie
Okay. So, I guess the important thing to remember is that COVID-19 is an infection. Most health and social care workers at some level, albeit basic, will have had some kind of infection control training. And this will be part of their mandatory training schedule. So, if I were to give a list of things to go and refresh yourself on, one of them would be the standard infection control precautions. And there are 10 of them, but I think there are a few that we need to pay particular attention to. We've seen quite a lot of them on the news, and this is the advice that's coming out from the government, and the NHS and Public Health England, and all of those bodies.
1. Hand washing
So, number one, standard infection control precaution would be increased hand hygiene. I'm not going to go over it. We all know we need to washing our hands for at least 20 seconds.
2. Cough hygiene
The next thing, and again, this has been highlighted across the news, is our respiratory and cough hygiene. The phrase, "catch it, bin it, kill it," we're seeing that everywhere. So, number two, practice good respiratory hygiene.
3. Keep your environment clean: cleaning and disinfecting
Number three, I would say, and this is quite an important one, but it hasn't been covered as extensively as some of the others, would be around managing our environment. So, really rigorous cleaning and disinfecting.
Now, I say those two things separately because they are two separate processes.
Cleaning is removing of visible dirt, and disinfecting is a more sophisticated process using chemicals.
So, we would normally clean first, and then disinfect after. And it is absolutely pointless disinfecting unless you've cleaned away the dirt first.
So, a lot of the common disinfectants, I think the one most people are using are sodium hypochlorite, or bleach. So, cleaning and disinfecting, really really important. And I cannot stress enough please do not overlook your cleaning up tips. They are an essential part of your infection control team. And just up skilling them around the difference between cleaning and disinfection, and they will be so important in drawing up and maintaining your cleaning schedules.
4. Personal Protective Equipment (PPE)
The thing I'm getting asked a lot about at the moment is what PPE we should be using. So, we've all got our basic PPE. We've got our aprons. We've got our gloves. But, the one I'm getting asked about all the time is face masks. So, I just want to provide a little bit of clarity around the face masks and when to use them. So, there are essentially two types. We have the normal surgical face mask, and then we have a more sort of sophisticated face mask, which you would have seen them on the news. They have sort of a filter device on the front of them. So, the surgical face mask is worn for droplets. The filtering device face mask is worn whenever there's a risk of airborne transmission. So, there is a helpline. So, if any providers are really struggling to get hold of supplies, there is a helpline they can ring. It's called the National Supply Disruption Line, and they can be called on 0800 915 9964.
38.08 Summary
Liam
Okay. Perfect. Is there anything else? I mean we've had a vere wide ranging conversation, and I'll sort of reflect on it, and sort of wrap it up a bit later. It's quite a lot to take in. Is there anything else that you want to tell us about the original brief which was to take the infection control sort of framework and models, apply it to this virus so that we could have a way of getting our heads around it, how to approach it, how to think about it, how to respond to it? Is there anything else that you'd like to add, Josie?
Josie
Yeah. I think just to summarize really. We need to take a sensible, rational approach. We need to listen to the guidance that's coming out, and it is changing by the day. So, keep yourself up to date with reliable scientific evidence and guidance. If you can, knock out the chain of infection, and then correlate your infection control precautions to each link in the chain of your infection. You've got to draw it out on a big bit of paper or something, do that. Just really think about how you're applying your standard infection control precautions to break the chain of infection.
Liam
Brilliant. And we've got those six that you talked about earlier. So, we can all certainly do that. All right, thank you. Josie, this was quite a difficult brief, but I think we've done it justice. We've probably put about a total of probably six to eight hours into it, I would have thought, maybe a bit more, maybe 10 hours. I hope the listeners enjoy. Our original brief was to have an intelligent, informed conversation about this difficult subject. We haven't shied away from it, and I hope you've, in some ways, enjoyed the experience. It's certainly been a pleasure to have you on the Podcast.
Josie
Thank you so much. I guess, like the rest of the country, I'm remote working. So, if anybody needs any advice, just give me a call.
Liam
Wonderful. And how would they find you, Josie?
Josie
I'm very active on LinkedIn. We have a website, Advanced Clinical Solutions. So, just look us up.
Liam
So, there you have it. Again, very many thanks to Josie Winter for this special episode. What did you think? Did you get something from it?
For me, it was a timely reminder about the importance of the chain of infection. I found that really helpful, as was reflecting on the mode of transmission. Is it airborne or through droplets only?
There's no clear answers here yet, but I think it's a good question, as that informs of which type of protective equipment is needed. Really important.
The other point that really stood out for me was talking about the immune system and how the virus is likely to have an adverse impact to those whose immune system is impaired.
That gave me something important to think about because prior to that, I was thinking that it was the severity of the virus that was causing these terrible illnesses for people.
And the idea that the reason why they're becoming so sick is because their immune system is compromised, and because they don't release the antibody that fights the virus. I found that really helpful, kind of reassuring, actually. I hope I've understood and quoted that correctly.
Inevitably, just to close then, I mean with such a broad and complex subject, I wonder if this was helpful.
I wonder if I achieved my modest goal.
Josie and I put about nine hours into creating this episode. We made sacrifices in the evenings and weekends to do it. I think if it's made things a little bit clearer for you, it's certainly worth it.
So, I'm going to close now, and I really hope that helps. Stay safe, everyone.
About this contributor
Registered Home Manager
Liam Palmer is the author of 3 books on raising quality standards in care homes through developing leadership skills. In Oct 2020, he published a guide to the Home Manager role called "So You Want To Be A Care Home Manager?". Liam has been fortunate to work as a Senior Manager across many healthcare brands including a private hospital, a retirement village and medium to large Care Homes in the private sector and 3rd sector. He hosts a podcast "Care Quality - meet the leaders and innovators”.
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