“Doctor, is COVID-19 coming back again?” The question is being asked once again. After years of living with the virus, most people have gradually returned to their normal lives. Masks have disappeared from faces.
COVID testing is no longer a routine part of everyday life. The daily counting of cases and deaths has stopped dominating television screens and newspaper headlines. For many, the pandemic has become a painful memory. But the virus has not disappeared. COVID-19 continues to circulate in different parts of the world, with new variants and sub-variants continuing to emerge.
According to the World Health Organization’s recent surveillance updates, SARS-CoV-2 remains a significant respiratory pathogen and continues to cause infections, hospitalisations, deaths and post-COVID conditions. The situation today is very different from the devastating waves of 2020 and 2021, largely because of vaccination, previous infections, improved medical care and a greater understanding of the disease.
But a virus becoming less frightening does not mean that it has ceased to exist. Recent reports of COVID-19 cases in India, including cases in Andhra Pradesh, have once again brought the disease into public discussion. The detection of newer Omicron sub-lineages is a reminder that viruses continue to evolve.
This is not a reason for panic. But it is certainly a reason to remember. Because the greatest danger after a pandemic may not be fear. It may be forgetting.
The declaration of COVID-19 as a pandemic and the escalating fatalities caused by the worldwide spread of SARS-CoV-2 led to an unprecedented global effort to understand the virus and control its transmission.
A review published in Fortune Journal of Health Sciences in 2022 noted that research rapidly began examining how the virus spreads, how new variants emerge and which measures could reduce the risk of infection. Vaccines were developed at remarkable speed, and vaccination programmes were launched across the world.
Yet, even after devastating waves of infection and death, COVID-19 did not disappear. The virus continued to evolve, while important questions remained regarding the duration and strength of immunity after natural infection and the effectiveness of vaccination across different populations. The pandemic therefore taught the world an important lesson: controlling an infectious disease requires not one intervention, but continuous surveillance, scientific research and multiple layers of protection.
The Virus that never really left
The COVID-19 pandemic changed the way the world understood infectious diseases. A virus that was initially unfamiliar spread across continents within a remarkably short period of time. Hospitals became overwhelmed. Healthcare workers worked under extraordinary conditions. Families were separated. Oxygen became a life-saving commodity.
Ordinary activities such as standing in a queue, travelling in a bus or attending a gathering suddenly became potential opportunities for exposure. The pandemic also demonstrated that the spread of an infectious disease is influenced not only by the virus, but also by human behaviour. According to the World Health Organization, SARS-CoV-2 continues to spread through infectious respiratory particles released when an infected person breathes, talks, coughs or sneezes. The risk of transmission is influenced by several factors, including the distance between people, duration of exposure, ventilation and the amount of infectious virus being released. The virus has changed since 2020.
Population immunity has increased. Vaccines have reduced the risk of severe disease. Doctors now understand COVID-19 far better than they did during the first wave. However, the basic principles of respiratory infection have not changed. When people are brought close together, the opportunities for transmission increase. When exposure continues for a longer duration, the risk may increase further.
When ventilation is poor, infectious particles may accumulate. And when several risk factors occur together, the chances of transmission become greater.
The air around us matters
During the early months of the pandemic, the scientific understanding of COVID-19 transmission continued to evolve. Initially, considerable attention was given to contaminated surfaces and large 2 respiratory droplets.
As scientific evidence accumulated, the importance of smaller respiratory particles and aerosols became increasingly recognised. The World Health Organization and the U.S. Centers for Disease Control and Prevention have both emphasised the importance of factors such as close proximity, respiratory particles and ventilation in understanding the transmission of respiratory viruses.
This does not mean that there is one magical distance beyond which infection becomes impossible. There is no such guarantee. A person standing close to an infectious individual may be exposed to a greater concentration of respiratory particles, particularly during prolonged interaction. In a poorly ventilated room, infectious particles may remain suspended and accumulate over time.
Outdoors, air movement and dilution may reduce the concentration of infectious particles, although close-range exposure can still occur. The science may be complex. The basic message is not. Distance matters. Ventilation matters. Duration of exposure matters. And reducing unnecessary close contact can reduce opportunities for transmission. The challenge, however, is that maintaining physical distance is not always easy.
When distance becomes difficult
During the pandemic, people were repeatedly advised to maintain physical distance. The advice was scientifically sound. But how practical was it? In India, millions of people live in densely populated urban and semi-urban areas. People need to visit markets, ration shops, pharmacies and other public places to obtain essential commodities. During the pandemic, many individuals were compelled to spend one or two hours in queues. A queue may begin with people standing apart.
But as time passes, the distance between individuals gradually decreases. Someone moves forward. Someone else looks for shade. A group gathers near the entrance of a shop. People begin to stand closer together. During hot weather, individuals who have been standing in the sun for a long time naturally look for a shaded area.
Several people may then gather under the same small area of shade. The problem is not always that people do not understand the importance of physical distancing. Sometimes, the problem is that there is no simple and practical way to maintain it. 3 It was while considering this problem during the COVID-19 pandemic that the Kutikuppala Umbrella Principle was proposed.
An umbrella as a personal buffer
The idea was simple. Could an ordinary umbrella, already available in many households, help people maintain physical distance in crowded outdoor spaces? Yes. It was based on a simple concept: creating space. When two individuals standing in a queue each hold an open umbrella, the physical span of the umbrellas naturally creates a visible buffer between them. It becomes more difficult for people to stand extremely close together or huddle into a single small space.
The umbrella, therefore, serves two purposes. It protects the individual from the sun or rain, and it can also act as a practical reminder of personal space. A study conducted in Visakhapatnam during the COVID-19 pandemic examined public awareness and perceptions regarding COVID-19 prevention and practical methods of maintaining physical distance.
The study included respondents from both urban and rural areas and different age groups and educational backgrounds. The findings were interesting. Among the respondents, 76.9% considered the use of a regular umbrella while visiting public places to obtain essential goods to be an effective and practical method of maintaining physical distance.
Many respondents also reported spending one to two hours in public places while procuring essential commodities. The principle behind the Kutikuppala Umbrella Principle was subsequently reflected in public health measures adopted in several parts of the world.
The concept of using umbrellas to help maintain physical distance was seen in countries including the United Kingdom, France and Australia, as well as in several states of the United States. In India, similar practices were observed in Maharashtra, Odisha and Andhra Pradesh. In Visakhapatnam, senior officials of the Excise and Police Departments also advised people standing in long queues outside grocery shops and liquor outlets to carry umbrellas while waiting to collect essential goods.
The simple idea was to create a physical buffer between individuals, thereby helping maintain social distance and reduce the risk of COVID-19 transmission. The Kutikuppala Umbrella Principle was proposed as an innovative, simple, readily available and low-cost method of helping create physical space between individuals in appropriate situations. It was an idea born out of a very practical question: when people cannot avoid going out, can they be helped to remain physically separated from one another?
An umbrella is inexpensive. It is familiar. It is easily available. It requires no specialised technology. And in certain outdoor situations, it can help create a visible physical boundary between individuals. Sometimes, the simplest public-health measures are the easiest to adopt. A properly used umbrella can offer protection not only against COVID-19, but also against several airborne and respiratory infections, including tuberculosis, pneumonia and the common cold, while also providing an additional layer of protection from air pollution and other environmental hazards.
Lessons from COVID-19
The COVID-19 pandemic taught us that a new virus can emerge suddenly, spread rapidly across borders and overwhelm healthcare systems. It also showed that surveillance, genomic sequencing, hospital preparedness, healthcare-worker protection and clear public communication are essential before the next crisis arrives. The next pandemic may be caused by another coronavirus, influenza or a pathogen that has not yet been identified. Its exact nature cannot be predicted.
But one lesson is certain: preparedness must combine advanced science with practical thinking. The Kutikuppala Umbrella Principle emerged from a simple observation during the COVID-19 pandemic—that in crowded public places, creating physical space between individuals can help reduce close-range transmission.
As COVID-19 cases once again appear in the news, the principle deserves to be remembered not as a replacement for vaccines, ventilation or other evidence-based measures, but as an example of how simple, affordable ideas can contribute to public-health protection. When the next pandemic arrives, the world will need sophisticated science and advanced medical technology. But it should also remain open to simple, practical innovations.
