pet(4) marker(3) Rhesus monkeys(3) lung tissue(3) PET-CT(3) diagnostic(3) initial(3) pulmonary lesion(3) Chest(3) dendritic cell(3) Lymph node(3) lesions(3) positive(3) Inflammation(3) TSPO(3) pulmonary inflammation(3) added(3) Swab(3) nonhuman primates(3) increased expression(3) pulmonary lesions(3) principal(3) COVID-19(3) lung(3) TSPO.(3) timepoint(3) swabs(3) Blood(3) Activation(3) injection(3)