Covid-19 is transmitted not only by direct contact but also by droplets of nebulized saliva in the air. So how to avoid getting infected at home? Here are the results of an international study conducted, among others, by CNR-Isac scientists and published in the International Journal of Environmental Research and Public Health.
How to Avoid Infections
Let’s start with the guidelines. To avoid internal contamination and therefore the spread of the virus in the rooms, it is necessary to maintain an adequate degree of humidity and an adequate air exchange. This is according to a study published in the International Journal of Environmental Research and Public Health by Cnr-Isac, performed together with the Leibniz Institute for Tropospheric Research, the CSIR-National Physical Laboratory of India and the 2B Technologies-Boulder (USA).
How the virus spreads
The virus spreads not only through direct contact, but also through the air “Although the size of the virus itself is about 100 nanometers (the diameter of a hair is 50,000-180,000 nanometers), the person infected, through breathing, vocalization and coughing, sneezing emits aerosols that may contain Sars-Cov-2, explained Francesca Costabile a researcher at the Institute of Atmospheric and Climate Sciences of the National Research Council (Cnr-Isac).
These aerosol particles vary greatly in size, “from less than 1,000 nanometers, the diameter of fine powders, to values greater than 5,000 nanometers, the size of typical respiratory droplets,” continues Francesca Costabile. “The relationship between the inhaled dose while breathing and Sars-Cov-2 infectivity strongly depends on the size: the ability to penetrate the lower respiratory tract, the systemic distribution throughout the human body and the attack on particularly sensitive target organs. in particular the brain “.
Dry conditions and cold weather are most not recommended
According to the CNR-Isac study, viral particles are abundant “in environments without solar radiation” and are favored by “cold and dry conditions”.
Recommendations and advice
“On this basis, in environments with cold and dry direct sunlight and insufficient ventilation, it is recommended, first of all, to maintain adequate humidification of the indoor air (in the range of 40-60%), especially in temperature conditions below 20 ° C, to use SHU air purifiers or sanitizers to measure the concentration of carbon dioxide (CO2) in the air, keeping below 1000 ppm. Finally, the use of nebulizers in some medical procedures is not recommended and some disinfectants for cleaning, such as those with hydrogen peroxide. Without these precautions, the risks may persist when wearing a surgical mask. “