human lung anatomy and virus infection, understanding respiratory health, viral pathogenesis, disease, prevention

understanding pathogenesis microbiology respiratory coronavirus prevention understand protection healthcare bronchitis immunology infection treatment breathing pulmonary diaphragm pneumonia beautiful sickness wellness hospital medicine pandemic pathogen thoracic anatomy disease explore threats patient therapy illness biology science medical alveoli bronchi trachea health system oxygen doctor breath immune asthma human virus viral germs cough lung cold flu