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    Man in hazardous material protective clean suit standing behind window with illumination. — Stock Photo
    Man in hazardous material protective clean suit standing behind window with illumination.
    Man in hazardous material protective suit facing bright light in hallway. — Stock Photo
    Man in hazardous material protective suit facing bright light in hallway.
    Human lungs with pneumonia and close-up of bacteria and viruses. — Stock Photo
    Human lungs with pneumonia and close-up of bacteria and viruses.
    Man in white protective clean suit, blue gloves and breathing mask. — Stock Photo
    Man in white protective clean suit, blue gloves and breathing mask.
    Parents giving son asthma inhaler — Stock Photo
    Parents giving son asthma inhaler
    Human lungs with viral pneumonia and close-up of virions. — Stock Photo
    Human lungs with viral pneumonia and close-up of virions.
    Human lungs with viral pneumonia and close-up of virions. — Stock Photo
    Human lungs with viral pneumonia and close-up of virions.
    Low angle view of man in protective suit and mask standing with clipped breathing hose. — Stock Photo
    Low angle view of man in protective suit and mask standing with clipped breathing hose.
    Doctor listening to boy's heartbeat at house call — Stock Photo
    Doctor listening to boy's heartbeat at house call
    Male doctor using stethoscope on girl patient in hospital room — Stock Photo
    Male doctor using stethoscope on girl patient in hospital room
    Human lungs with pneumonia and close-up of bacteria and viruses. — Stock Photo
    Human lungs with pneumonia and close-up of bacteria and viruses.
    Human lungs with viral pneumonia and close-up of virions. — Stock Photo
    Human lungs with viral pneumonia and close-up of virions.
    Man in a red jacket breathing in aroma of fragrant yellow flowers of shrub. — Stock Photo
    Man in a red jacket breathing in aroma of fragrant yellow flowers of shrub.
    Human lungs with viral pneumonia and close-up of virions. — Stock Photo
    Human lungs with viral pneumonia and close-up of virions.
    Humpback whales (Megaptera novaeangliae) taking a breath of air before diving in the waters of the Great Bear Rainforest; Hartley Bay, British Columbia, Canada — Stock Photo
    Humpback whales (Megaptera novaeangliae) taking a breath of air before diving in the waters of the Great Bear Rainforest; Hartley Bay, British Columbia, Canada
    Care worker helping senior man with inhaler. — Stock Photo
    Care worker helping senior man with inhaler.
    Mature man playing sax with eyes closed — Stock Photo
    Mature man playing sax with eyes closed
    Medical teacher demonstrating tracheal intubation using demonstration model. — Stock Photo
    Medical teacher demonstrating tracheal intubation using demonstration model.
    Mature man playing sax with eyes closed — Stock Photo
    Mature man playing sax with eyes closed
    Senior man using peak flow meter and looking in camera. — Stock Photo
    Senior man using peak flow meter and looking in camera.
    Male playing sax with eyes closed — Stock Photo
    Male playing sax with eyes closed
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies. — Stock Photo
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies.
    Mature male in glasses playing sax with eyes closed on black background — Stock Photo
    Mature male in glasses playing sax with eyes closed on black background
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Senior man using peak flow meter on white background. — Stock Photo
    Senior man using peak flow meter on white background.
    Male doctor practicing cardiopulmonary resuscitation on infant training dummy. — Stock Photo
    Male doctor practicing cardiopulmonary resuscitation on infant training dummy.
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies. — Stock Photo
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies.
    Doctor practicing tracheal intubation on training dummy. — Stock Photo
    Doctor practicing tracheal intubation on training dummy.
    Senior man playing sax at stage — Stock Photo
    Senior man playing sax at stage
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies. — Stock Photo
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies.
    Doctor practicing tracheal intubation on training dummy. — Stock Photo
    Doctor practicing tracheal intubation on training dummy.
    Doctors practicing tracheal intubation on infant training dummies. — Stock Photo
    Doctors practicing tracheal intubation on infant training dummies.
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies. — Stock Photo
    Female and male doctors practicing cardiopulmonary resuscitation on infant training dummies.
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    Woman doing yoga tree pose on sand dune against blue sky — Stock Photo
    Woman doing yoga tree pose on sand dune against blue sky
    Male doctor checking unconscious man breathing. — Stock Photo
    Male doctor checking unconscious man breathing.
    Close-up of cute little girl breathing on window with reflection — Stock Photo
    Close-up of cute little girl breathing on window with reflection
    Doctors practicing tracheal intubation on infant training dummies. — Stock Photo
    Doctors practicing tracheal intubation on infant training dummies.
    Senior man using peak flow meter and looking in camera. — Stock Photo
    Senior man using peak flow meter and looking in camera.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Senior man playing sax with band — Stock Photo
    Senior man playing sax with band
    Doctor practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctor practicing bag-valve-mask ventilation on training dummy.
    Senior man using incentive speedometer with tube. — Stock Photo
    Senior man using incentive speedometer with tube.
    Elementary age boy blowing up yellow balloon. — Stock Photo
    Elementary age boy blowing up yellow balloon.
    Male doctors practicing tracheal intubation on training dummy. — Stock Photo
    Male doctors practicing tracheal intubation on training dummy.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Male doctor practicing rescue breathing on cardiopulmonary resuscitation training dummy. — Stock Photo
    Male doctor practicing rescue breathing on cardiopulmonary resuscitation training dummy.
    Doctor practicing tracheal intubation on training dummy. — Stock Photo
    Doctor practicing tracheal intubation on training dummy.
    Senior man using peak flow meter, close-up. — Stock Photo
    Senior man using peak flow meter, close-up.
    Senior man using peak flow meter, close-up. — Stock Photo
    Senior man using peak flow meter, close-up.
    Doctor practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctor practicing bag-valve-mask ventilation on training dummy.
    Senior woman using inhaler with female doctor watching. — Stock Photo
    Senior woman using inhaler with female doctor watching.
    Asthmatic boy using inhaler, close-up. — Stock Photo
    Asthmatic boy using inhaler, close-up.
    Doctor practicing tracheal intubation on infant training dummy. — Stock Photo
    Doctor practicing tracheal intubation on infant training dummy.
    Boy blowing up yellow balloon on red background. — Stock Photo
    Boy blowing up yellow balloon on red background.
    Intubation training dummy with tube. — Stock Photo
    Intubation training dummy with tube.
    Doctor practicing tracheal intubation on training dummy. — Stock Photo
    Doctor practicing tracheal intubation on training dummy.
    Doctor practicing tracheal intubation on infant training dummy. — Stock Photo
    Doctor practicing tracheal intubation on infant training dummy.
    Nurse adjusting controls on ventilator attached to unconscious patient. — Stock Photo
    Nurse adjusting controls on ventilator attached to unconscious patient.