COVID-19 pandemic

The COVID-19 pandemic was a worldwide outbreak of the infectious disease COVID-19 that spread across many countries at the same time.

• Cause: COVID-19 is caused by a virus called SARS-CoV-2. Viruses are tiny germs that can enter our body and multiply inside our cells.
• Why it became a “pandemic”: An outbreak is called a pandemic when it spreads over a very large area (many countries/continents) and affects a large number of people.
• How it spreads: It mainly spreads through respiratory droplets and tiny airborne particles released when an infected person talks, coughs, sneezes, or breathes—especially in crowded, closed spaces.
• What it did to the body: The virus mostly affects the respiratory system. Many people had mild illness, but some developed serious breathing problems, especially older adults and people with certain health conditions.
• Link to immunity and vaccines: Vaccines against COVID-19 helped the immune system learn to recognise the virus and respond faster, reducing the chance of severe disease. Some vaccines used mRNA instructions to teach cells to make a harmless piece of the virus so the body could practise defending itself.
• Why it matters: The pandemic showed how important public health measures (like masks, ventilation, hygiene, and isolation when sick) and vaccination are for protecting not only individuals but whole communities.