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They discovered a pattern of continuous variation, or gradient, from a relatively high infectivity of SARS-CoV-2 in cells lining the nasal passages, to less infectivity in cells lining the throat and bronchia, to relatively low infectivity in lung cells.

Bronchitis, from Greek"—blow the derivation!—"inflammation of the membrane of the bronchia.

Profuse sweats during a soporose state, bull� and gangrenous spots, obstruction of the bronchia with mucus or serum, pneumonia or pericarditis,—these are all grave indications.

Portions of these foreign bodies are often found in the bronchia as well, giving rise to circumscribed lobular pneumonia.

When the affection is confined to the bronchia and pulmonary parenchyma, there are the usual signs of bronchitis, disturbed breathing, with hard, soft, mucous, or dry husky cough, and blowing, mucous or sibilant r�le, at points crepitation, and at others some diminution of murmur and resonance.