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The airborne transmission of viruses including influenza and Covid19

Airborne transmission is the spread of infectious pathogens including fungi, bacteria and viruses over great distances in the air.

Tens of millions of small, light droplets that we emit when we talk, cough or sneeze, which can contain infectious particles, often remain floating in indoor spaces for minutes. The small dust particles that can carry these infectious pathogens (fungi, bacteria, viruses) are called droplet nuclei. They have a diameter of about 1 to 5 ┬Ám (micrometers) and can float in the air for several hours over greater distances. Known diseases as a result of this transmission include: tuberculosis and measles. These are the 'aerosols' or virus mists and hence the name airborne or aerosol transmission.

Large drops of saliva usually fall to the floor within one second when talking or coughing. These larger dust particles that can carry infectious pathogens are called droplets. They are larger than droplet nuclei and fall quickly to the ground or surface at a short distance (about 1 meter). Known diseases as a result of this transmission include: flu (influenza) and SARS.

Especially inhaling the invisible small infectious droplet nuclei can lead to the development of symptoms.
Covid19

Source: Bedking.be