Causes of swine flu

Swine flu is caused by infection with the H1N1 influenza A virus. Understanding how it spreads explains almost everything about preventing it.

The cause

• The H1N1 influenza A virus, a human flu virus that circulates seasonally. The name comes from the 2009 strain's origin in swine flu viruses, but today's virus spreads between people, not from pigs.
• You cannot get swine flu from pork. Properly cooked pork carries no flu risk.

How it spreads

• Respiratory droplets: an infected person coughs, sneezes, or talks, and others breathe in the virus - the main route
• Contaminated hands and surfaces: virus from a doorknob, phone, or railing reaches your nose, mouth, or eyes through your own hands
• Close contact: crowded homes, classrooms, offices, buses, and gatherings accelerate spread
• Contagious window: infected people spread the virus from about a day before symptoms start to 5 to 7 days after - longer in children

Who catches it more easily

• Anyone unvaccinated during flu season
• People in crowded living or working conditions
• Healthcare workers and family members caring for a flu patient

What raises the risk of SEVERE disease (different from catching it)

• Pregnancy - one of the strongest risk factors
• Children under 5, especially under 2
• Adults over 65
• Chronic conditions: asthma, diabetes, heart disease, kidney or liver disease
• Weakened immunity from illness or medicines

Seasonality

In India, H1N1 circulates year-round but peaks in the monsoon and winter months, varying by region - northern states peak in winter, some southern and western states see monsoon surges.

Ayurvedic view (interpretive): Classical texts associate seasonal epidemics with seasonal imbalance and weakened digestion/immunity, an interpretive frame. The established cause is viral transmission through droplets and hands.

Remember: H1N1 spreads through coughs, sneezes, and hands to the face - anyone can catch it, but pregnancy, age, and chronic illness decide how dangerous it gets. Crowded monsoon and winter months are peak season.