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Why Seasonal Infections Spread Faster In Winter And What Makes The Cold Months Riskier
Why Seasonal Infections Spread Faster In Winter And What Makes The Cold Months Riskier
During the winter season, there is a significant rise in cases of coughs, colds, flu, sinus infections, bronchitis, and stomach bugs. This increase is not merely coincidental; winter creates the perfect biological and behavioural conditions for infections to spread more quickly, survive longer, and affect larger groups of people simultaneously.
Dr Sameer Bhati, Public Health Analyst, shares what you need to know:
Cold weather weakens our defence mechanisms
Cold temperatures reduce blood flow to the nasal passages and airways, which weakens the local immune response. The respiratory tract is lined with mucus that becomes dry and less efficient at trapping viruses and bacteria in cold weather. This allows pathogens to enter the body more easily, where they can begin to reproduce.
Viruses survive longer in winter
Several respiratory viruses, including influenza and RSV, are known to survive longer in cold, dry air without losing their infectivity. Reduced humidity allows viral particles to remain airborne for extended periods, increasing the likelihood of inhalation. The use of indoor heaters further dries the air, worsening the situation.
Crowded indoor spaces increase transmission
Winter forces people into enclosed, poorly ventilated spaces such as homes, offices, schools, and public transport. Close proximity combined with inadequate air circulation makes it easier for infections to spread from person to person.
Winter months can suppress immune function
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Reduced sunlight exposure during winter leads to lower vitamin D levels, which play an important role in regulating the immune system. Additionally, winter-related lifestyle changes such as altered sleep patterns, dietary habits, and reduced physical activity can further weaken immunity, making individuals more susceptible to infections.
Winter does not cause infections; rather, it creates conditions in which they thrive. The goal is not to fear winter, but to understand its effects and prepare accordingly to protect one's health.
Source: News18
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