Flu is a viral disease caused by different genres of influenza virus. In general, cases of infection tend to increase in winter. For what reason? Here we explain it.
In times of pandemic, COVID-19 has monopolized all media and investigations globally.
Even so, we continue to have other viruses in circulation that, even though they are less dangerous, cause discomfort and severe symptoms exceptionally.
This is the case of the flu, a disease that often spreads in winter.
Entering the month of May, with the increase in temperature that it entails.
you may be wondering: “Why does the flu peak in its prevalence in autumn and winter, practically disappear in spring?” In this discussion, we try to answer.
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These are single-stranded RNA viruses, which are covered by an external lipid layer that gives them their characteristic rounded appearance.
According to the World Health Organization, there are 4 types of seasonal flu:
The global incidence calculated at 20%, that is, that 20% of the world population spends it at a certain point.
Besides, it is a selective pathology since, in certain population groups, it can reach a 50% incidence.
Due to its epidemiological importance, influenza has been the subject of multiple studies.
Flu is a viral disease whose cases increase, especially in winter.
A study published in the scientific journal Plos Pathogens explains the relationship of influenza with climatic factors:
It seems that the central hypothesis evidenced in this experiment: low temperatures, dryness promote the spread of the virus. Why?
Various assumptions try to explain why low relative humidity favors the spread of influenza:
At high relative humidities, the aerosols expelled by the patient could quickly adhere to water molecules in the medium.
Thus increasing their volume and precipitating earlier. This would decrease the speed, distance traveled by the virus.
Low temperatures provide an environment conducive to the transmission of influenza-causing viruses.
In this case, the explanation could be a little easier. At low temperatures, the nasal mucosa cools when taking the air.
This would create a micro environment more conducive to the virus, which could replicate better.
This would translate into a higher viral load with each sneeze, spray, thus favoring transmission.
Therefore, we have been able to see that the seasonality of influenza has a precise scientific meaning.
In the northern hemisphere, this virus begins to rebound in October, the peak observed between December, February.
These data agree with those observed in the exposed study since they are cold.dry months.
Luckily, the human being has an annual flu vaccine. Its problematic potential almost nullified.
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