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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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Monthly Healthy Potluck at Health Hubs: Building Community Wellness in India

Community-driven health initiatives are becoming an essential part of India’s preventive healthcare movement. While medical technology, AI diagnostics and digital screenings strengthen clinical care, lifestyle habits still remain the foundation of long-term wellness. One powerful but simple community practice gaining popularity is the Monthly Healthy Potluck at Health Hubs.

These potlucks promote healthier eating, strengthen social support systems, and bring people together to learn about nutrition and wellness in an enjoyable and accessible format. SecondMedic’s preventive health framework aligns perfectly with this model by integrating health education, nutrition insights and early-risk awareness into community activities.

This blog explores how monthly healthy potlucks are transforming health hubs across India and supporting preventive lifestyle habits at scale.

Why Community Wellness Matters in India

India is witnessing a steep rise in lifestyle-related illnesses.
According to the ICMR-NCD Burden Study:
• Over 100 million Indians live with diabetes
• Heart disease accounts for nearly 28% of all deaths
• Hypertension is becoming prevalent across younger age groups

Simultaneously, NFHS-5 data highlights increasing obesity, poor dietary diversity and rising sedentary behaviour. These challenges signal not just medical issues, but lifestyle gaps.

Community-based wellness initiatives provide the social support and collective learning required to bridge those gaps.

What Is a Monthly Healthy Potluck at Health Hubs?

A Monthly Healthy Potluck is a wellness event where:
• Participants bring nutritious homemade dishes
• Recipes focus on balance, low oil and whole ingredients
• Everyone eats together and shares food philosophy
• Health experts provide short preventive care sessions
• Participants learn simple, realistic lifestyle habits

This model transforms health hubs into interactive wellness environments instead of passive medical facilities.

Why Healthy Potlucks Work

1. They Make Healthy Eating Enjoyable

Healthy meals often feel restrictive when practiced alone. In a group setting, they become exciting because:
• People discover new recipes
• Participants try dishes they wouldn’t normally cook
• Food presentation inspires creativity
• Everyone learns portion control naturally

2. They Promote Social Accountability

When people cook, share and learn together, they form supportive communities that motivate consistent lifestyle changes.

3. They Strengthen Nutritional Awareness

Nutrition education becomes simpler when demonstrated through real food instead of lectures.

4. They Align with Preventive Healthcare

NITI Aayog’s Preventive Health & Wellness Report highlights behavioural change as a key driver of long-term health improvement. Potlucks encourage achievable, small lifestyle shifts.

Components of a Healthy Potluck at SecondMedic Health Hubs

1. Balanced Dish Contributions

Participants are encouraged to bring nutrient-dense dishes such as:
• Millet-based meals
• Vegetable-rich Indian curries
• Lean protein options
• Low-oil tiffin-style foods
• Fermented dishes
• Fruit bowls and salads

This ensures variety, balance and education through real examples.

2. Nutrition Spotlights

Health experts share quick insights on:
• Portion control
• Glycemic index
• Healthy cooking oils
• Hidden sugars
• Smart plate design
• Hydration science

These micro-education sessions empower participants to make better decisions at home.

3. Preventive Health Mini-Screenings

SecondMedic integrates:
• BMI checks
• Blood pressure assessments
• Sugar evaluations
• Quick fatigue and stress scoring

These screenings help individuals understand their health status while encouraging early intervention.

4. Recipe Exchange Corners

Participants document and exchange easy-to-cook healthy recipes. This fosters a culture of shared learning and innovation.

5. Wellness Activities

Events may include:
• 5-minute yoga routines
• Breathing exercises
• Mindfulness techniques
• Movement challenges

These fun micro-activities teach participants how to incorporate wellness effortlessly into daily routines.

How Healthy Potlucks Support India’s Preventive Health Movement

Encouraging Long-Term Dietary Shifts

When individuals repeatedly attend monthly events, their meal choices gradually transform. Consistency builds habits.

Reducing Fear Around Healthy Cooking

Seeing others prepare simple, tasty, low-oil dishes removes the stigma that healthy food is bland or difficult.

Strengthening Social Connectivity

Community bonds reduce stress, loneliness and isolation-factors known to weaken immunity and increase chronic disease risk.

Improving Health Literacy

Real-time demonstrations outperform written instructions. It becomes easier to understand nutrient density, fibre-rich meals and balanced plates when they are visually presented.

Supporting Digital Health Ecosystems

SecondMedic integrates event data into digital dashboards:
• Meal analysis
• Health scores
• Lifestyle tracking
• Preventive alerts

This combination of offline community activity and online tracking strengthens long-term adherence.

Example of a Healthy Potluck Spread

• Moong dal khichdi with vegetables
• Ragi roti with garlic chutney
• Grilled paneer salad
• Millet upma
• Fruit and nut platter
• Sprout chaat with lemon
• Buttermilk infused with mint

These items are affordable, accessible and easy to prepare-ideal for the Indian lifestyle.

Conclusion

Monthly Healthy Potlucks at Health Hubs offer a simple yet powerful model for promoting preventive healthcare in India. These events blend nutrition, social bonding, lifestyle learning and community-led motivation. They encourage individuals to adopt healthier habits without pressure, restriction or complexity.

With SecondMedic’s integrated preventive care framework, these potlucks become more than social gatherings-they become catalysts for building healthier communities, improving dietary behaviour and supporting long-term wellness.

References

• ICMR NCD Burden Study - Lifestyle & Dietary Risk Factors in India
• National Family Health Survey (NFHS-5), Ministry of Health & Family Welfare
• NITI Aayog - Preventive Health & Community Wellness Framework
• Lancet Public Health India - Impact of Community Nutrition Programs
• WHO Guidelines on Community Health Promotion
• Statista India Wellness & Healthy Eating Behaviour Report
• EY-FICCI Integrated Preventive Care Model for India

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