The COVID-19 pandemic began in late 2019 in Wuhan, China, and became one of the most serious global health crises in recent history. The virus, called SARS-CoV-2, was first linked to a seafood market, but its exact origin is still unclear. It spread rapidly worldwide, leading the World Health Organization (WHO) to declare a pandemic in March 2020. Over 7 million deaths have been officially reported, though experts believe the actual number could exceed 20 million. Older adults and people with pre-existing health conditions face the highest risks. Vaccines were developed within a year, helping reduce severe cases, but unequal vaccine access between wealthy and poorer nations highlighted global health inequalities and raised concerns about future pandemics.

The virus continues to evolve, with variants like Delta and Omicron keeping scientists vigilant. Omicron, identified in late 2021, spread faster but caused milder illness, partly due to vaccine protection and previous infections. Long COVID, with symptoms like fatigue and memory issues, still affects millions. Research on new treatments and vaccines, including nasal options, is ongoing. Experts emphasize the importance of improving healthcare systems and monitoring for new variants to prepare for future crises.