Influenza has long been considered a seasonal virus. Factors including indoor crowding during cold weather, seasonal fluctuations in host immune responses, relative humidity, temperature, and UV radiation have all been suggested to account for this phenomenon, but none of these hypotheses had previously been tested directly.

Advertisement

The researchers tested the effects of temperature and relative humidity on infected and naive guinea pigs. The study found that low relative humidity of 20%-30% induced the rapid spread of the virus, with the opposite effect at 80% or above. Also, results showed that the virus spread more easily at 5 °C than at 20 °C, with no transmission at 30 °C.

The data implicates that low relative humidity produced by indoor heating and winter temperatures favour the spread of influenza. This study should serve as the basis for understanding the seasonality of other viral infections. – (EurekAlert!)

Source: PLoS Pathogens
 

Print this article on

Rate this article Poor 1 2 3 4 5 Excellent

JOBS

Civil Engineering Technician Gauteng - Johannesburg Financial Manager R380,000-400,000 Per Annum Cost To Company Gauteng - West Rand Treasury Specialist R300,000-380,000 Per Annum Cost To Company Gauteng - Johannesburg JAVA DEVELOPER (YL028 – 04/09) Gauteng DELPHI DEVELOPER (YL023 – 04/09) R320,000-360,000 Per Annum Cost To Company Market Related Gauteng Senior and Lead .NET Developers (C#.NET, Arc, Design, Code.) R300,000-600,000 Per Annum Cost To Company Gauteng - Johannesburg A C# Developer (C Sharp Developer) Gauteng - Johannesburg A C++ Developer (Software Developer) Gauteng - Pretoria Find more jobs Register your CV Post a job