CLINICAL MEDICINE

Detailed explanation-1: -Etiology: Causative agents of lower respiratory infections are viral or bacterial. Viruses cause most cases of bronchitis and bronchiolitis. In community-acquired pneumonias, the most common bacterial agent is Streptococcus pneumoniae.

Detailed explanation-2: -A number of infectious respiratory diseases, such as flu, measles, mumps, rubella and whooping cough, are vaccine-preventable. Stay home when you are ill. When you are ill, allow a few feet of distance from others. Cover coughs and sneezes with your elbow or tissue but not your hand.