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Published on: Apr 20, 2020
3 minute read
By: Dr Rajan Choudhary

Is Herd Immunity A Valid Strategy For COVID 19?

Yesterday we explained you what Herd Immunity means and how it works, today we will take the discussion further to determine whether it is effective and can be recommended in the current context.

COVID-19 currently does not have a cure or a vaccine. Lockdown is the only strategy that appears to be working. Could implementing policies that encourages herd immunity be used to accelerate immunity in the population without the need for a vaccine?

INFECTIVITY

For the strategy to work we need to know a few things about the virus. How infective is it? In one of our earliest blogs we discussed infectivity at length and determined that the R0 (infectivity) may be between 2 and 3. This means each person with the virus can infect around 2-3 people at a time. Whilst this is not as high as Mumps (10-12) it is much higher than the common flu. The higher the R0 the more people that need to be immunised before herd immunity is achieved. For COVID it is estimated that 70% of the population need to be infected.

This is based off our current testing. Due to shortages in testing kits, only testing those that have a high likelihood of being infected and poorly organised testing infrastructure in some countries, we are likely underestimating. The number of people infected may be much higher as we are missing those that are asymptomatic but still have the disease and are still passing the disease on.

MORTALITY

Secondly, we need to know the mortality from COVID-19. Early estimates of mortality were as high as 10%, as we had little data on how many people were truly infected, but as the number of infected cases rose, and testing amongst the infected and symptomatic population rose, a more accurate mortality has been found to be around 1%. There is a risk we may still be underestimating the true mortality, as some cities have noted a spike in cardiac deaths, and some evidence supports possible cardiac damage due to COVID. But from the data we have, we know its mortality is lower than MERS (34%) and SARS (10%) but more than influenza (0.1%).

estimates of the COVID-19 case fatality rate

Whilst we have some data on who is likely to suffer from severe COVID symptoms (elderly, immunocompromised, people with heart or lung problems) we still cannot accurately determine who will get severe COVID in the “low risk” population. Simply because someone is young and healthy does not mean they will not die from COVID.

LENGTH OF IMMUNITY

Third we need to know how long this immunity will last. Similar coronaviruses responsible for the common cold usually create immunity that lasts for a few months, which is why we often get the cold repeatedly. A virus is also very prone to mutations that can change the structure and functions of its proteins, proteins responsible for tagging, latching on to and entering cells. If the structure of these proteins changes enough, then our antibodies will not be able to bind on, and new types of antibodies will have to be made with a slightly different structure. This effectively means our bodies have to start from step 1 again to create immunity, and we have to make new vaccines. This mutation rate is why we have to make new vaccines every season for the flu.

LONG TERM COMPLICATIONS

Finally, we need to know if there are any long-term implications from a viral infection. Again, this is something we do not know yet, as the virus has only been around for a few months. There may be implications for the cardiovascular system, long term breathing problems or more. And even if the complication rate appears relatively low (say, 1%), if millions of people are allowed to get infected, by definitions thousands or tens of thousands of people will have these complications, complications that can lead to issues later in life or an early death.

CONCLUSION

So, is herd immunity a viable strategy for COVID? Without a safe vaccine the general consensus appears to be no.

We don’t know how infective the virus really is or how many people it has infected

A 1% death rate is still very high. This means for every 100 people to be infected; one will die. This would mean hundreds of thousands of people dead in a country with a population over 10 million. It is unacceptably high.

If the death rate is 1%, then hospitalisation rate is likely higher. Almost all countries do not have capacity to have 1% of the population in hospital. Overwhelming the healthcare system will lead to poorer care, and worse care for those who do not have COVID. Leading to more people coming to serious harm or dying as a result of poor healthcare, not because of COVID.

We don’t know the long-term effects of COVID. By purposefully infecting people instead of waiting for a vaccine we may be causing unnecessary damage to a person’s health that only becomes apparent later in life. But this is speculation as we do not currently know if COVID has long term effects,

We don’t know if all of the risks above will amount to anything. The immunity may not last long enough, leading to another spike in infections and mortality.

Mass vaccination appears to be the safest strategy. And though human clinical trials have started on a number of vaccines, we are still months away from deployment. Until then we should not come out of lockdown prematurely, not until we have received an unbiased assessment from public health officials that states it is safe.

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Walking Meetings via Voice Chat: A Smarter Way to Boost Health and Productivity in Remote Teams

Remote work has transformed how teams collaborate, but it has also increased sedentary behaviour. Long hours of sitting in front of screens contribute to fatigue, musculoskeletal pain and reduced mental focus. In this context, walking meetings conducted via voice chat have emerged as a simple yet effective corporate wellness practice that aligns productivity with health.

Walking meetings do not require additional time, special equipment or complex planning. They simply reimagine how meetings are conducted.

The Sedentary Challenge in Remote Work

According to WHO and ICMR data:

prolonged sitting increases the risk of heart disease, diabetes and musculoskeletal problems
remote employees often sit longer than office-based workers
screen fatigue negatively affects mental health and productivity

Traditional video meetings unintentionally reinforce inactivity.

What Are Walking Meetings?

Walking meetings are conversations held while participants walk instead of sitting.

In remote settings, these meetings:

are conducted via voice calls
eliminate the need for video screens
allow participants to move freely

They are ideal for one-on-one discussions, team check-ins and brainstorming sessions.

Why Voice Chat Works Best for Walking Meetings

Voice-only meetings:

reduce screen dependency
allow safer movement
encourage active listening

Without visual distractions, participants often engage more deeply in conversation.

Health Benefits of Walking Meetings

Reduced Sedentary Time

Even short walks help:

improve blood circulation
reduce stiffness
activate muscles

WHO recommends breaking prolonged sitting every 30–60 minutes.

Cardiovascular Support

Regular walking:

improves heart health
lowers blood pressure
supports metabolic health

Incorporating movement into meetings contributes to daily activity goals.

Musculoskeletal Relief

Walking reduces:

neck and back strain
shoulder tension
joint stiffness

This is particularly valuable for desk-bound employees.

Mental Health and Cognitive Benefits

Improved Focus and Creativity

Movement increases blood flow to the brain.

Studies cited by Lancet show that walking enhances:

problem-solving
creativity
memory recall

Many people report clearer thinking during walking discussions.

Stress Reduction

Walking helps:

lower cortisol levels
improve mood
reduce mental fatigue

This supports emotional wellbeing in high-pressure work environments.

Productivity Benefits for Organisations

Walking meetings:

reduce meeting fatigue
improve engagement
shorten meeting duration due to focused discussion

Employees often return to tasks feeling refreshed rather than drained.

Cultural Shift Toward Wellness-Oriented Work

Encouraging walking meetings signals:

trust in employees
commitment to wellbeing
flexibility in work culture

This improves morale and retention.

How to Implement Walking Meetings in Remote Teams

Simple steps include:

designating certain meetings as “audio-only”
encouraging participants to walk indoors or outdoors
keeping meetings concise
sharing agendas in advance

Clear guidelines ensure safety and effectiveness.

Safety and Practical Considerations

Best practices include:

avoiding walking in unsafe or crowded areas
using earphones for clarity
walking at a comfortable pace
pausing movement when taking notes

Inclusivity is important—walking should be optional, not mandatory.

Who Benefits Most from Walking Meetings?

Walking meetings are especially helpful for:

remote workers
hybrid teams
roles with frequent discussions
employees experiencing screen fatigue

They are less suitable for data-heavy presentations.

Walking Meetings as Part of Corporate Wellness Programs

Walking meetings complement:

ergonomics initiatives
mental health programs
physical activity challenges

They integrate wellness into daily workflows rather than adding extra tasks.

Long-Term Impact on Workplace Health

Over time, organisations adopting movement-friendly practices observe:

reduced burnout
improved energy levels
healthier work routines

Preventive health strategies are most effective when embedded into daily habits.

Role of Preventive Healthcare Awareness

NITI Aayog and WHO emphasise lifestyle modification as a core preventive health strategy.

Walking meetings align perfectly with this approach by:

reducing inactivity
promoting movement
supporting mental wellbeing

Small changes deliver cumulative benefits.

Conclusion

Walking meetings conducted via voice chat are a practical, low-cost and highly effective way to improve employee health and productivity in remote teams. By replacing sedentary meetings with movement-based conversations, organisations can reduce screen fatigue, enhance focus and support long-term wellbeing. In a remote-first world, walking meetings represent a smarter way to work—where productivity and health move forward together.

References

World Health Organization (WHO) – Physical Activity and Sedentary Behaviour Guidelines
Indian Council of Medical Research (ICMR) – Lifestyle and Non-Communicable Disease Reports
Lancet – Physical Activity, Cognition and Workplace Health Studies

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