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Published on: Jul 07, 2020
1 minute read
By: Dr Rajan Choudhary

Asymptomatic Carriers Of COVID

Why Asymptomatic carriers of COVID are as dangerous as symptomatic patients

Many countries have now begun enforcing masks for everyone to wear when out in public, in enclosed spaces, or on public transport. There is good evidence to support these measures, but unfortunately, some still show resistance to the idea. Whilst some reasons put forward are non-sensical (masks do not cause any noticeable or measurable decrease in oxygen delivery to the body), other people feel like they shouldn’t wear a mask because they do not have symptoms of COVID. And thus would not spread anything. Here we look at a recent publication in Nature, one of the most esteemed peer-reviewed scientific journals in the world, and what it shows us about the transmission of COVID in a population.

This study by Lavezzo et al looked at the suppression of the SARS-CoV-2 outbreak in the Italian municipality of Vo’. This municipality is 50 kilometers west of Venice with a population of just 3,416 people. It experienced its first casualty of COVID on the 21st of February, after which it underwent lockdown for 14 days. During this time data was collected on the clinical presentation and hospitalization of COVID patients, as well as other citizens through the contact tracing network.

In total 2,812 residents were tested in late February, with another 2,343 tests performed two weeks later at the end of lockdown. Nasal and throat swabs were taken to identify infected individuals. The study found only 2.6% of people were positive for COVID at the start of lockdown, which reduced to 1.2% two weeks later.

Out of this infected population, 42.5% were asymptomatic. They had no symptoms at the time of swab testing nor did they develop symptoms afterwards. When the viral load was measured between symptomatic and asymptomatic patients, there was little difference.

Evidence has pointed to a large asymptomatic population, and previous studies have shown it to be as high as 50% in some cases. Many would assume if a patient has no symptoms then they must have fought the infection before it became an issue, or had a very low viral load and therefore were not likely to spread it. This study shows it is simply not true. Asymptomatic carriers of COVID are likely to contribute to the transmission and spread of COVID amongst the population.

If you are asymptomatic you have as high a viral load as someone who is symptomatic. But there is no way to tell without a swab. You have as much of a potential to spread the infection to the vulnerable. Even in people who became symptomatic the height of transmission was found to be before the patient showed any symptoms.

So what does this mean? If you have COVID you are likely to spread it before you show any symptoms or any symptoms at all. We know masks are effective at significantly reducing the spread of COVID, by catching the water droplets that carry the SARS-CoV-2 Virus. Now that shops and public places are re-opening, the risk of spread is high.

Wear a mask. Stop the spread.

https://www.nature.com/articles/s41586-020-2488-1_reference.pdf suppression of a SARS article

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Health Risks of Sedentary Lifestyle: Why Sitting Too Much Can Harm Your Health

Modern lifestyles have become increasingly sedentary. With the rise of desk jobs, digital devices and long working hours, many individuals spend a significant portion of their day sitting. While technology and convenience have improved productivity, they have also contributed to reduced physical activity.

Understanding the health risks of a sedentary lifestyle is essential for preventing chronic diseases and maintaining overall wellbeing.

What Is a Sedentary Lifestyle?

A sedentary lifestyle refers to a pattern of behavior characterized by prolonged sitting or inactivity with minimal physical movement.

Common examples include:

Sitting at a desk for long hours
Watching television for extended periods
Spending significant time on computers or smartphones
Limited engagement in physical exercise

When the body remains inactive for long durations, various physiological functions may become impaired.

1. Increased Risk of Obesity

Physical inactivity reduces calorie expenditure.

When calorie intake exceeds the energy burned through activity, excess calories are stored as body fat.

This can lead to weight gain and increase the risk of obesity.

Obesity is a major risk factor for several chronic health conditions.

2. Higher Risk of Cardiovascular Disease

Prolonged sitting has been associated with increased risk of heart disease.

Sedentary behavior may contribute to:

Elevated blood pressure
Increased cholesterol levels
Reduced blood circulation

These factors increase the likelihood of cardiovascular complications over time.

3. Increased Risk of Type 2 Diabetes

Physical activity helps regulate blood sugar levels.

A sedentary lifestyle may impair the body’s ability to use insulin effectively, leading to insulin resistance.

Over time, this can increase the risk of developing type 2 diabetes.

4. Poor Metabolic Health

Metabolism refers to the body’s ability to convert food into energy.

Long periods of inactivity may slow metabolic processes and reduce the body’s efficiency in managing glucose and fat levels.

This can contribute to metabolic syndrome.

5. Musculoskeletal Problems

Sitting for extended periods can strain muscles and joints.

Common issues include:

Lower back pain
Neck stiffness
Shoulder discomfort
Poor posture

These problems are particularly common among office workers.

6. Reduced Mental Wellbeing

Physical activity plays a significant role in supporting mental health.

Sedentary behavior may contribute to:

Increased stress levels
Reduced mood
Lower energy levels

Regular movement helps improve mental wellbeing.

7. Increased Risk of Premature Mortality

Studies have shown that prolonged inactivity may increase the risk of early death due to chronic diseases.

Maintaining an active lifestyle significantly improves long-term health outcomes.

Sedentary Lifestyle in the Indian Context

Urbanization and technological advancements have led to more sedentary work environments in India.

Long commuting hours, desk-based professions and digital entertainment have reduced physical activity levels for many individuals.

As a result, lifestyle-related diseases such as diabetes and heart disease have increased significantly in recent years.

Public health initiatives now emphasize the importance of regular physical activity to counter these trends.

How to Reduce Sedentary Behavior

Take Frequent Movement Breaks

Stand up and stretch every 30–60 minutes during work.

Incorporate Walking into Daily Routine

Short walks during breaks can improve circulation and energy levels.

Use Active Workstations

Standing desks or adjustable workstations encourage movement.

Exercise Regularly

Engage in moderate physical activity such as walking, cycling or yoga.

Health guidelines recommend at least 150 minutes of exercise per week.

Limit Screen Time

Reducing recreational screen time encourages more active habits.

Benefits of an Active Lifestyle

Increasing daily physical activity provides several health benefits:

Improved cardiovascular health
Better weight management
Enhanced mental wellbeing
Stronger muscles and bones
Improved metabolic function

Even small lifestyle changes can make a significant difference over time.

When to Seek Medical Advice

Consult a healthcare professional if you experience:

Persistent back pain
Unexplained weight gain
Chronic fatigue
Signs of metabolic disorders

Early intervention can help manage health risks effectively.

Conclusion

A sedentary lifestyle may significantly impact physical and mental health. Prolonged sitting and lack of movement increase the risk of obesity, cardiovascular disease, diabetes and musculoskeletal problems.

Adopting an active lifestyle that includes regular movement, exercise and healthy habits is essential for maintaining overall wellbeing.

Simple changes such as standing frequently, walking regularly and engaging in physical activity can greatly reduce the health risks associated with sedentary behavior.

Maintaining an active lifestyle is one of the most effective ways to support long-term health and prevent chronic disease.

References

World Health Organization – Physical Activity Guidelines
Indian Council of Medical Research – Lifestyle Disease Reports
National Family Health Survey – Health and Lifestyle Data
Lancet Global Health – Sedentary Behavior Research
Journal of Preventive Medicine – Physical Activity Studies

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