Bronchiolitis is an acute infectious disease of the lower respiratory tract(inflammation of the bronchioles),most often it occurs in children less than 3 years old.

SYMPTOMS:
-Viral Upper Respiratory Infection(URI) including cough,continuous watery mucus discharge from the nose,low grade fever.In rare cases
 lower respiratory tract may occur in infants and young children including difficult respiration(dyspnea),paroxysmal cough.
Other symptoms include
-Fever(range of 38.5-39°C)
-wheezing,Noisy breathing
-Bluish skin color due to the decrease of oxygen in the blood
-Irritability & Poor feeding
-pharyngitis
-Inflammation of the middle ear(Otitis)
-Tachypnea(rapid breathing,50-60 breaths per minute),
-Tachycardia(rapid heartbeat,over 100 beats per minute)

CAUSES:
It is mainly caused by Respiratory syncytial virus(RSV) and others including Adenovirus, parainfluenza less common agents such as
Enterovirus, Mycoplasmic pneumoniae, Rhinovirus, Chlamydia pneumoniae, contact with the infectious person..

TREATEMENT:
Hospital care includes- Humidified oxygen supply, nebulizing with bronchodilators, cardiorespiratory monitoring,maintain adequate hydration,controlling Fever & Tachypnea.
Antibiotics are needed for bacterial infection/Otitis media.

Both the diseases are related with respiratory system.The symptoms are much similar, but the disease is not the same.

Bronchitis is an inflammation of the bronchi.It usually affects old children and adults.Mostly it is caused by influenza virus sometimes it may bacterial infection.If untreated it may lead to chronic bronchitis and pneumonia.

Bronchiolitis is an inflammation of the bronchioles(Bronchi are further divided into bronchioles).It usually affects premature infants and mostly caused by Respiratory Syncytial Virus(RSV) or other viruses. Children with weak immune system and not breast feed are more prone to get bronchiolitis. If remain untreated it may lead to middle ear bacterial infection and bronchial hyperactivity (asthma) later.Wheezing in children is mainly due to bronchiolitis viral infection.