MEMORIAL DAY 2020
At the start of a war against a fierce opponent we should pause and remind ourselves of those who have fought and sacrificed their lives for us. We are in a fight to protect innocent vulnerable fellow citizens. We are not being asked to carry a gun, we are only being asked to avoid close contact with others, wear a mask, use proper hygiene, get tested when we have warning signs of infection, and isolate ourselves while infected.
We are all foot soldiers in a battle with a pretty aggressive virus. No one has been drafted and placed under a strict command structure. We haven’t even been asked to volunteer, yet we have sacrificed our freedom and income in the defense of our neighbors. We have listened to the clear voices of some grim faced doctors and scientists coming through the political fog. Memorial Day might remind us to stop and tip our hats to the folks on our street, in NYC, in Montana and every corner of our country for joining the fight,
Memorial Day is often celebrated at graveside events with speeches by long winded local politicians surrounded by solemn veterans. We can sometimes see the pain that is still in their eyes that reminds us that those who fought and survived also sacrificed.
What we admire most about those on the front lines is not so much their bravery but their willingness to fight on through their fear. Too often we have shown more appreciation than support.
I think the best way we could celebrate those who have fought to protect us is to remind ourselves that they were also fighting to make this a better world for all. Maybe we could do the same. Lets celebrate by committing to their memory by doing what the scientists ask, but also work to fix the inequities that this pandemic has revealed.
When the battle is over will the actions that we are taking now be remembered with a smile by future generations on the last Monday in May.
COMING OUT OF HIDING
A highly infectious new virus was looking for a home. No one invited him in, so he broke into home after home and started to settle in. He offended his hosts by killing them.
Even before this happened all homeowners were told that he was dangerous. Hearing this almost all the homeowners took immediate action to protect themselves. They hid from the virus. Hiding was difficult but it was the only magic pill that they had at the time. They knew that if all homeowners hid as soon as they heard, the virus will give up and go away after a while. With time and caution they could then come out of hiding.
In the US we have taken a different path. We waited and the virus got a foothold and eventually began wreaking havoc. This got our attention and we eventually went into hiding. We are doing our best, but how will we know when we can come out? Who will tell us when it is safe, and what will it look like?
The answer to all these questions is, “We don’t know”, because so much depends on us.
What we do for the rest of the year will determine how successful we will be.
We do have some choices. We are an active people and being holed up usually doesn’t fit our nature.
REENTRY
Will the economy come roaring back?
Probably not, if a long term recovery is our goal. A smart, safe and well planned reentry with health safety as the primary goal could prevent the virus from wreaking generations long financial havoc.
Many corporations including Detroit’s General Motors are planning a slow startup with the health of the workers dictating the timetable.
How will we know when we can emerge from our confinement and what will it look like? These questions keep coming up and I still haven’t heard an answer that we can say, “That’s it”. No one can predict the future when there are so many unknowns, Our scientists are getting more and more data and are learning more and more about the strengths and weaknesses of the virus.. They can only guess how we will behave.
Without a coherent national directive we have been left with a mishmash of messages from 50 earnest state leaders giving us 50 different sets of guidelines and reentry schemes. Meanwhile our local leaders are busy scrambling to heal us when we fall ill. Everyone is trying to help, but we sure could use someone to tell us what we can expect and what we can do about it.
We will each be making personal decisions that will affect those we love and many others whom we don’t know. Our country is somewhat unique, in that we have been given two paths, choose to consider others or choose to stand alone. So it is important that we take this into consideration when we each make the decision when to reemerge into the world that will include maskless adventurers among the crowd.
Because of this our recovery will take longer, add more sacrificial deaths and economic pain, but it appears that is the path that we will be allowed to take.
Here is some of what Columbia University’s Mark Lilla wrote last Sunday.
“We are not well designed, it seems, to live in uncertainty. Rousseau exaggerated only slightly when he said that when things are truly important, we prefer to be wrong than to believe nothing at all.But the post-Covid future doesn’t exist. It will exist only after we have made it.
We should ask only what we want to happen, and how to make it happen, given the constraints of the moment.
Apart from the actual biology of the coronavirus — which we are only beginning to understand — nothing is predestined. How many people fall ill with it depends on how they behave, how we test them, how we treat them and how lucky we are in developing a vaccine.
The result of those decisions will then limit the choices about reopening that employers, mayors, university presidents and sports club owners are facing. Their decisions will then feed back into our own decisions, including whom we choose for president this November. And the results of that election will have the largest impact on what the next four years will hold.
The pandemic has brought home just how great a responsibility we bear toward the future, and also how inadequate our knowledge is for making wise decisions and anticipating consequences. Perhaps that is why our prophets and augurs can’t keep up with the demand for foresight.
At some level, people must be thinking that the more they learn about what is predetermined, the more control they will have. This is an illusion. Human beings want to feel that they are on a power walk into the future, when in fact we are always just tapping our canes on the pavement in the fog.
The pandemic has brought home just how great a responsibility we bear toward the future, and also how inadequate our knowledge is for making wise decisions and anticipating consequences. Perhaps that is why our prophets and augurs can’t keep up with the demand for foresight.
At some level, people must be thinking that the more they learn about what is predetermined, the more control they will have. This is an illusion. Human beings want to feel that they are on a power walk into the future, when in fact we are always just tapping our canes on the pavement in the fog.
A dose of humility would do us good in the present moment. It might also help reconcile us to the radical uncertainty in which we are always living. Let us retire our prophets and augurs. And let us stop asking health specialists and public officials for confident projections they are in no position to make — and stop being disappointed when the ones we force out of them turn out to be wrong. (A shift from daily to weekly news conferences and reports would be a small step toward sobriety.)
It is bad enough living with a president who refuses to recognize reality. We worsen the situation by focusing our attention on litigating the past and demanding certainty about the future. We must accept what we are, in any case, condemned to do in life: tap and step, tap and step, tap and step ….”
Also,
Here is the poet James Autry who is the author of several books of poems and practical philosophy, including Looking Around for God, The Servant Leader, Love and Profit: The Art of Caring Leadership and his latest, Choosing Gratitude: Learning to Love the Life You Have.
“Messages of Hope for the Cynical World”
They arise from chalk on city sidewalks, from voices rising in song from balconies creating impromptu choirs. From westerners who venture outside and howl at the moon with the coyotes. From the syncopated city rhythms surging from improvised drums.
All expressions of life and unity, All affirmations of our need for one another, All ways of saying stay well, Instead of saying goodbye.
Please look at this short video. James understands the depth of small moments.
We are being pummeled by uncertainty in this battle we are in. Please protect yourself from long term personal damage by pausing and turning your thoughts to the wonderful things that are still in your life. We have the luxury of determining our pace. Smile first and listen more. The big things are crumbling, but the little things are shining brightly. Kindness and beauty are still all around us. Pay attention.
John Osler
BONUS READ
It is important to know what is possible. Here are facts that can help keep you safe and hopeful written by Dr Erin Bromage.
The Risks – Know Them – Avoid Them
It seems many people are breathing some relief, and I’m not sure why. An epidemic curve has a relatively predictable upslope and once the peak is reached, the back slope can also be predicted. We have robust data from the outbreaks in China and Italy, that shows the backside of the mortality curve declines slowly, with deaths persisting for months. Assuming we have just crested in deaths at 70k, it is possible that we lose another 70,000 people over the next 6 weeks as we come off that peak. That’s what’s going to happen with a lockdown.
As states reopen, and we give the virus more fuel, all bets are off. I understand the reasons for reopening the economy, but I’ve said before, if you don’t solve the biology, the economy won’t recover.
There are very few states that have demonstrated a sustained decline in numbers of new infections. Indeed, the majority are still increasing and reopening. As a simple example of the USA trend, when you take out the data from New York and just look at the rest of the USA, daily case numbers are increasing. Bottom line: the only reason the total USA new case numbers look flat right now is because the New York City epidemic was so large and now it is being contained. So throughout most of the country we are going to add fuel to the viral fire by reopening. It’s going to happen if I like it or not, so my goal here is to try to guide you away from situations of high risk.
Where are people getting sick?
We know most people get infected in their own home. A household member contracts the virus in the community and brings it into the house where sustained contact between household members leads to infection.
But where are people contracting the infection in the community? I regularly hear people worrying about grocery stores, bike rides, inconsiderate runners who are not wearing masks…. are these places of concern? Well, not really. Let me explain.
In order to get infected you need to get exposed to an infectious dose of the virus; based on infectious dose studies with MERS and SARS, some estimate that as few as 1000 SARS-CoV2 viral particles are needed for an infection to take hold. Please note, this still needs to be determined experimentally, but we can use that number to demonstrate how infection can occur. Infection could occur, through 1000 viral particles you receive in one breath or from one eye-rub, or 100 viral particles inhaled with each breath over 10 breaths, or 10 viral particles with 100 breaths. Each of these situations can lead to an infection.
How much Virus is released into the environment?
A Bathroom: Bathrooms have a lot of high touch surfaces, door handles, faucets, stall doors. So fomite transfer risk in this environment can be high. We still do not know whether a person releases infectious material in feces or just fragmented virus, but we do know that toilet flushing does aerosolize many droplets. Treat public bathrooms with extra caution (surface and air), until we know more about the risk.
A Cough: A single cough releases about 3,000 droplets and droplets travels at 50 miles per hour. Most droplets are large, and fall quickly (gravity), but many do stay in the air and can travel across a room in a few seconds.
A Sneeze: A single sneeze releases about 30,000 droplets, with droplets traveling at up to 200 miles per hour. Most droplets are small and travel great distances (easily across a room).
If a person is infected, the droplets in a single cough or sneeze may contain as many as 200,000,000 (two hundred million) virus particles which can all be dispersed into the environment around them.
A breath: A single breath releases 50 – 5000 droplets. Most of these droplets are low velocity and fall to the ground quickly. There are even fewer droplets released through nose-breathing. Importantly, due to the lack of exhalation force with a breath, viral particles from the lower respiratory areas are not expelled.
Unlike sneezing and coughing which release huge amounts of viral material, the respiratory droplets released from breathing only contain low levels of virus. We don’t have a number for SARS-CoV2 yet, but we can use influenza as a guide. We know that a person infected with influenza releases about 3 – 20 virus RNA copies per minute of breathing.
Remember the formulae: Successful Infection = Exposure to Virus x Time
If a person coughs or sneezes, those 200,000,000 viral particles go everywhere. Some virus hangs in the air, some falls into surfaces, most falls to the ground. So if you are face-to-face with a person, having a conversation, and that person sneezes or coughs straight at you, it’s pretty easy to see how it is possible to inhale 1,000 virus particles and become infected.
But even if that cough or sneeze was not directed at you, some infected droplets–the smallest of small–can hang in the air for a few minutes, filling every corner of a modest sized room with infectious viral particles. All you have to do is enter that room within a few minutes of the cough/sneeze and take a few breaths and you have potentially received enough virus to establish an infection.
But with general breathing, 20 copies per minute into the environment, even if every virus ended up in your lungs, you would need 1000 copies divided by 20 copies per minute = 50 minutes.
Speaking increases the release of respiratory droplets about 10 fold; ~200 copies of virus per minute. Again, assuming every virus is inhaled, it would take ~5 minutes of speaking face-to-face to receive the required dose.
The exposure to virus x time formulae is the basis of contact tracing. Anyone you spend greater than 10 minutes with in a face-to-face situation is potentially infected. Anyone who shares a space with you (say an office) for an extended period is potentially infected. This is also why it is critical for people who are symptomatic to stay home. Your sneezes and your coughs expel so much virus that you can infect a whole room of people.
What is the role of asymptomatic people in spreading the virus?
Symptomatic people are not the only way the virus is shed. We know that at least 44% of all infections–and the majority of community-acquired transmissions–occur from people without any symptoms (asymptomatic or pre-symptomatic people). You can be shedding the virus into the environment for up to 5 days before symptoms begin.
Infectious people come in all ages, and they all shed different amounts of virus. The figure below shows that no matter your age (x-axis), you can have a little bit of virus or a lot of virus (y-axis). (ref)
The amount of virus released from an infected person changes over the course of infection and it is also different from person-to-person. Viral load generally builds up to the point where the person becomes symptomatic. So just prior to symptoms showing, you are releasing the most virus into the environment. Interestingly, the data shows that just 20% of infected people are responsible for 99% of viral load that could potentially be released into the environment (ref)
So now let’s get to the crux of it. Where are the personal dangers from reopening?
When you think of outbreak clusters, what are the big ones that come to mind? Most people would go to the cruise ships. But you would be wrong. Ship outbreaks don’t even land in the top 50 outbreaks to date.
Ignoring the terrible outbreaks in nursing homes, we find that the biggest outbreaks are in prisons, religious ceremonies, and workplaces, such a meat packing facilities and call centers. Any environment that is enclosed, with poor air circulation and high density of people, spells trouble.
Some of the biggest super-spreading events are:
Meat packing: In meat processing plants, densely packed workers must communicate to one another amidst the deafening drum of industrial machinery and a cold-room virus-preserving environment. There are now outbreaks in 115 facilities across 23 states, 5000+ workers infected, with 20 dead. (ref)
Weddings, funerals, birthdays: 10% of early spreading events
Business networking: Face-to-face business networking like the Biogen Conference in Boston in March.
As we move back to work, or go to a restaurant, let’s look at what can happen in those environments.
Restaurants: Some really great shoe-leather epidemiology demonstrated clearly the effect of a single asymptomatic carrier in a restaurant environment (see below). The infected person (A1) sat at a table and had dinner with 9 friends. Dinner took about 1 to 1.5 hours. During this meal, the asymptomatic carrier released low-levels of virus into the air from their breathing. Airflow (from the restaurant’s various airflow vents) was from right to left. Approximately 50% of the people at the infected person’s table became sick over the next 7 days. 75% of the people on the adjacent downwind table became infected. And even 2 of the 7 people on the upwind table were infected (believed to happen by turbulent airflow). No one at tables E or F became infected, they were out of the main airflow from the air conditioner on the right to the exhaust fan on the left of the room. (Ref)
Workplaces: Another great example is the outbreak in a call center (see below). A single infected employee came to work on the 11th floor of a building. That floor had 216 employees. Over the period of a week, 94 of those people become infected (43.5%: the blue chairs). 92 of those 94 people became sick (only 2 remained asymptomatic). Notice how one side of the office is primarily infected, while there are very few people infected on the other side. While exact number of people infected by respiratory droplets / respiratory exposure versus fomite transmission (door handles, shared water coolers, elevator buttons etc) is unknown. It serves to highlight that being in an enclosed space, sharing the same air for a prolonged period increases your chances of exposure and infection. Another 3 people on other floors of the building were infected, but the authors were not able to trace the infection to the primary cluster on the 11th floor. Interestingly, even though there were considerable interaction between workers on different floors of the building in elevators and the lobby, the outbreak was mostly limited to a single floor (ref). This highlights the importance of exposure and time in the spreading of SARS-CoV2.
Choir: The church choir in Washington State. Even though people were aware of the virus and took steps to minimize transfer; e.g. they avoided the usual handshakes and hugs hello, people also brought their own music to avoid sharing, and socially distanced themselves during practice. A single asymptomatic carrier infected most of the people in attendance. The choir sang for 2 1/2 hours, inside an enclosed church which was roughly the size of a volleyball court.
Singing, to a greater degree than talking, aerosolizes respiratory droplets extraordinarily well. Deep-breathing while singing facilitated those respiratory droplets getting deep into the lungs. Two and half hours of exposure ensured that people were exposed to enough virus over a long enough period of time for infection to take place. Over a period of 4 days, 45 of the 60 choir members developed symptoms, 2 died. The youngest infected was 31, but they averaged 67 years old. (corrected link)
Indoor sports: While this may be uniquely Canadian, a super spreading event occurred during a curling event in Canada. A curling event with 72 attendees became another hotspot for transmission. Curling brings contestants and teammates in close contact in a cool indoor environment, with heavy breathing for an extended period. This tournament resulted in 24 of the 72 people becoming infected. (ref)
Birthday parties / funerals: Just to see how simple infection-chains can be, this is a real story from Chicago. The name is fake. Bob was infected but didn’t know. Bob shared a takeout meal, served from common serving dishes, with 2 family members. The dinner lasted 3 hours. The next day, Bob attended a funeral, hugging family members and others in attendance to express condolences. Within 4 days, both family members who shared the meal are sick. A third family member, who hugged Bob at the funeral became sick. But Bob wasn’t done. Bob attended a birthday party with 9 other people. They hugged and shared food at the 3 hour party. Seven of those people became ill. Over the next few days Bob became sick, he was hospitalized, ventilated, and died.
But Bob’s legacy lived on. Three of the people Bob infected at the birthday went to church, where they sang, passed the tithing dish etc. Members of that church became sick. In all, Bob was directly responsible for infecting 16 people between the ages of 5 and 86. Three of those 16 died.
The spread of the virus within the household and back out into the community through funerals, birthdays, and church gatherings is believed to be responsible for the broader transmission of COVID-19 in Chicago. (ref)
Sobering right?
Commonality of outbreaks
The reason to highlight these different outbreaks is to show you the commonality of outbreaks of COVID-19. All these infection events were indoors, with people closely-spaced, with lots of talking, singing, or yelling. The main sources for infection are home, workplace, public transport, social gatherings, and restaurants. This accounts for 90% of all transmission events. In contrast, outbreaks spread from shopping appear to be responsible for a small percentage of traced infections. (Ref)
Importantly, of the countries performing contact tracing properly, only a single outbreak has been reported from an outdoor environment (less than 0.3% of traced infections). (ref)
So back to the original thought of my post.
Indoor spaces, with limited air exchange or recycled air and lots of people, are concerning from a transmission standpoint. We know that 60 people in a volleyball court-sized room (choir) results in massive infections. Same situation with the restaurant and the call center. Social distancing guidelines don’t hold in indoor spaces where you spend a lot of time, as people on the opposite side of the room were infected.
The principle is viral exposure over an extended period of time. In all these cases, people were exposed to the virus in the air for a prolonged period (hours). Even if they were 50 feet away (choir or call center), even a low dose of the virus in the air reaching them, over a sustained period, was enough to cause infection and in some cases, death.
Social distancing rules are really to protect you with brief exposures or outdoor exposures. In these situations there is not enough time to achieve the infectious viral load when you are standing 6 feet apart or where wind and the infinite outdoor space for viral dilution reduces viral load. The effects of sunlight, heat, and humidity on viral survival, all serve to minimize the risk to everyone when outside.
When assessing the risk of infection (via respiration) at the grocery store or mall, you need to consider the volume of the air space (very large), the number of people (restricted), how long people are spending in the store (workers – all day; customers – an hour). Taken together, for a person shopping: the low density, high air volume of the store, along with the restricted time you spend in the store, means that the opportunity to receive an infectious dose is low. But, for the store worker, the extended time they spend in the store provides a greater opportunity to receive the infectious dose and therefore the job becomes more risky.
Basically, as the work closures are loosened, and we start to venture out more, possibly even resuming in-office activities, you need to look at your environment and make judgments. How many people are here, how much airflow is there around me, and how long will I be in this environment. If you are in an open floorplan office, you really need critically assess the risk (volume, people, and airflow). If you are in a job that requires face-to-face talking or even worse, yelling, you need to assess the risk.
If you are sitting in a well ventilated space, with few people, the risk is low.
If I am outside, and I walk past someone, remember it is “dose and time” needed for infection. You would have to be in their airstream for 5+ minutes for a chance of infection. While joggers may be releasing more virus due to deep breathing, remember the exposure time is also less due to their speed.
While I have focused on respiratory exposure here, please don’t forget surfaces. Those infected respiratory droplets land somewhere. Wash your hands often and stop touching your face!
As we are allowed to move around our communities more freely and be in contact with more people in more places more regularly, the risks to ourselves and our family are significant. Even if you are gung-ho for reopening and resuming business as usual, do your part and wear a mask to reduce what you release into the environment. It will help everyone, including your own business. This article was inspired by a piece written by Jonathan Kay in Quillete
About the author
Erin S. Bromage, Ph.D., is an Associate Professor of Biology at the University of Massachusetts Dartmouth. Dr. Bromage graduated from the School of Veterinary and Biomedical Sciences James Cook University, Australia where his research focused on the epidemiology of, and immunity to, infectious disease in animals. His Post-Doctoral training was at the College of William and Mary, Virginia Institute of Marine Science in the Comparative Immunology Laboratory of late Dr. Stephen Kaattari.
Dr. Bromage’s research focuses on the evolution of the immune system, the immunological mechanisms responsible for protection from infectious disease, and the design and use of vaccines to control infectious disease in animals. He also focuses on designing diagnostic tools to detect biological and chemical threats in the environment in real-time.
Dr. Bromage joined the Faculty of the University of Massachusetts Dartmouth in 2007 where he teaches courses in Immunology and Infectious disease, including a course this semester on the Ecology of Infectious Disease which focused on the emerging SARS-CoV2 outbreak in China.
Comentarios