"highly contagious" = doesn't need a lot of copies to infect someone.
virus RNA detected in air (keeping in mind sampling usualy loses a lot of virus)
Hundreds of copies of virus were recovered in each mL of air near the patient head.
Hundreds of copies per mL in saliva.
Cheng, V.C.C., et al and K.-Y. Yuen. ‘Detection of Norovirus in Air Samples in a Non-Vomiting Patient: Implications of Testing Saliva for Norovirus in an Immunocompromised Host’. J Hosp Inf 103,no3 (Nov 2019): 357–58. doi.org/10.1016/j.jhin….
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It means negative pressure rooms and N95s, which is why they desperately do not want COVID to be called "Airborne".
This is why, during SARS, when a roomful of Canadian doctors and nurses got sick even though they were using "Droplet precautions" (I'll capitalize) - that is, medical masks - they invented AGMP, so they could explain how a droplet virus infected people using Droplet Precautions.