From there we have a cold cold ?

Do not forget a hat and scarf
Many people think that cold caused by cold weather - an urban legend, and yet, our parents since childhood forced us to dress warmly if the weather outside does not look like summer.And rightly so!

for rhinovirus, the main virus that causes the common cold, it is cold comfort replication condition.The lower the temperature, the weaker the immune response of the body, according to a scientific report, recently published in the Proceedings of the National Academy of Sciences.

human lung temperature is around 37 ° C, but in the sinuses it may vary from 33 to 35 ° C depending on air temperature.Previous studies have revealed that the rhinovirus replicates actively in the cooler atmosphere sinuses than light.However, these studies have focused on the influence of body temperature on the virus and not on the relationship between temperature and the immune response.

professor Akiko Iwasaki with a group of colleagues from Yale University have decided to consider the relationship between variations in the im

mune system caused by the temperature, and the spread of rhinovirus in the nasal sinuses and lungs.For this purpose they are "infected" cells taken from the respiratory tract of mice, rodents these characteristic views rhinovirus in temperature conditions of 33 to 37 ° C.They then measured the amount of virus replication and antiviral response in cells.

researchers found that the virus is spreading more sluggish at high temperature, and the immune response in these conditions has been more active, and vice versa.

in mice immunosuppressed, and the virus spread more rapidly at high temperatures, which indicates that "it is not so much in the virus, but in its reaction media - and this is the main aspect," says Iwasaki.Her team also found that two similar immune mechanisms work actively at 37 ° C than at 33 ° C.To summarize, the results relate the effectiveness of the spread of rhinovirus, causes fever and a protective immune response the virus carrier.

In general, the frosty winter air is quite able to reduce our defense before the common cold virus.

Source: zdorovie.com

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