Influenza A virus, subtype H3N2 virus, is a strain of the influenza virus that causes respiratory illness in humans. It is one of the most common strains of the influenza virus that circulates during the flu season. Kolkata, formerly known as Calcutta, is a city in eastern India. Like many other parts of the world, Kolkata experiences seasonal flu outbreaks, which can be caused by a variety of influenza viruses, including H3N2. Symptoms of H3N2 influenza virus infection are similar to those of other strains of the flu and can include fever, cough, sore throat, body aches, and fatigue. The flu is primarily spread through respiratory droplets that are released when an infected person talks, coughs, or sneezes.
Asthma is a chronic respiratory disease that affects the airways in the lungs. It causes inflammation and narrowing of the airways, which can lead to symptoms such as wheezing, coughing, chest tightness, and shortness of breath. Inhalers are commonly used to treat asthma. There are two main types of inhalers: Rescue inhalers: These inhalers contain a quick-acting medication called a bronchodilator, which helps to quickly open up the airways during an asthma attack. Rescue inhalers are typically used as needed to relieve symptoms. Controller inhalers: These inhalers contain a medication that helps to reduce inflammation in the airways and prevent asthma symptoms from occurring. Controller inhalers are typically used on a regular basis, even when there are no symptoms present.