There are many scientific studies that show the direct and indirect effects of low relative humidity on human health and how it can influence airborne infection.
Here is just a selection of the overwhelming evidence for maintaining an optimum indoor humidity of 40-60%RH for human health and wellbeing.
High humidity leads to loss of infectious influenza virus from simulated coughs
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Criteria for human exposure to humidity in occupied buildings
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Indirect health effects of relative humidity in indoor environments
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Influenza and humidity - Why a bit more damp may be good for you!
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Influenza virus transmission Is dependent on relative humidity and temperature
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Dynamics of airborne influenza A viruses indoors and dependence on humidity
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The influence of relative humidity on the infectivity of air-borne influenza A virus (PR8 strain)
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Modeling the airborne survival of influenza virus in a residential setting
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Absolute humidity and the seasonal onset of influenza in the continental United States
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The lethal effects of relative humidity on bacteria
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On the mucus flow rate in the human nose
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Nasal mucociliary transport in healthy subjects is slower when breathing dry air
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The dichotomy of relative humidity on indoor air quality
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The effect of low humidity on the human tear film
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Physiological and subjective responses to low relative humidity
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Humidification to reduce respiratory illnesses in nursery school children
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Humidification and upper respiratory infection incidence
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The effect of indoor relative humidity on absenteeism & colds in schools
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Winter humidities and related absenteeism in Canadian hospitals
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Is low indoor humidity a driver for healthcare-associated infections?
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