Kathmandu. Coronavirus, which rocked the whole world in 2019, is now returning to some places after two years. People are wondering why the virus never dies and why is it suddenly coming back? Let’s understand the scientific reason for this.
Viruses die or not?
Viruses are not living organisms, but they are very clever. They increase their numbers by staying inside the cells of humans, animals, or plants. If the virus does not find the host, it can become inactive or it may die. However, some viruses like corona can survive in the environment for some time. Also, if they continue to spread among people, they will not end.
Why is corona returning?
For some time now, cases of corona infection have been increasing again in countries like India, Singapore and Hong Kong. There are many scientific reasons behind this:
mutation in virus (mutation)
Coronavirus changes over time. It creates new variants through mutations. New variants such as NB.1.8.1 and LF.7 may reduce the efficacy of older vaccines. The JN1 variant is the most common in India. Which was found in 53 percent of the cases.
Reduced immunity
Immunity from a vaccine or previous infection may weaken over time. The ability to fight the virus decreases, especially in older people who do not receive booster doses. Singapore’s health officials say cases are rising due to low booster doses. ’
people being careless
When cases are low, people forget the rules like masks, sanitizers and social distancing. This allows the virus to spread again. As a result, it spreads rapidly in densely populated cities.
Weather and travel
Cold weather or rain can help spread the virus. Also, when people travel a lot, such as during holidays, the virus spreads from one place to another. Cases have increased in Singapore due to increased travel during the Chinese New Year.
Is it as dangerous as before?
Fortunately, the new variants often have mild symptoms such as fever, cough or cold. The symptoms of serious disease are less in the new cases. Most patients do not need hospitalization. Still, it is important to remain vigilant.
What to do to avoid this?
Use of masks: Regular use of masks, especially in crowded places.
Hand washing: Wash hands frequently with soap or use a sanitizer.
Booster dose: Booster dose of vaccine boosts immunity.
} Test if symptoms appear: Contact your doctor immediately if you have fever, cough, or difficulty breathing.
