Which of the following best describes the body's reaction to exposure to or invasion by antigens?

A female patient's chest radiograph shows bilateral lower lobe atelectasis. She is alert and ori-ented

Arterial blood gas analysis reveals mild hypoxemia and respiratory alkalemia; her vital signs are within normal limits. Which of the following is most appropriate at this time? a. Chest physiotherapy every 4 hours b. Continuous positive airway pressure +5 cm H2O c. Intrapulmonary percussive ventilation every 2 hours d. Intermittent positive-pressure breathing 35 cm H2O Q4

Identify and explain three main categories of disasters

What will be an ideal response?