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Even though many particles rapidly diffused to other surfaces, the models indicated that approximately 10 billion to 1 trillion particles could deposit into an adult's head airways and tracheobronchial region of the lungs.

According to one pilot study that was published in the peer-reviewed journal BMC Infectious Diseases, eight dogs were trained for 1 week to detect saliva or tracheobronchial secretions of SARS-CoV-2 infected patients.

“But for very young children, they more often breathe through their mouths, and a significant fraction is deposited in the lower airways — the tracheobronchial and pulmonary regions. The particles make it to the deepest regions of their lungs.”

Doubtless in these cases also the lymphocytosis is due to the stimulation and swelling of the tracheobronchial glands.

Extraction of Tacks, Nails and Large Headed Foreign Bodies from the Tracheobronchial Tree.—In cases of this sort the point presents the same difficulty and requires solution in the same manner as mentioned in the preceding paragraphs on the extraction of pins.