Coronavirus disease 2019 (COVID-19) is a contagious disease first identified in Wuhan, China, in December 2019. The disease has since spread worldwide, leading to an ongoing pandemic. The virus that causes COVID-19 spreads mainly when an infected person is in close contact with another person. Small droplets and aerosols containing the virus can spread from an infected person's nose and mouth as they breathe, cough, sneeze, sing, or speak.
Most common symptoms: fever, dry cough, tiredness
Less common symptoms: aches and pains, sore throat, diarrhea, conjunctivitis, headache, loss of taste or smell, a rash on the skin, or discoloration of fingers or toes.
The Spanish flu
The Spanish flu, also known as the 1918 influenza pandemic, was an unusually deadly influenza pandemic caused by the H1N1 influenza A virus. Lasting from February 1918 to April 1920, it infected 500 million people – about a third of the world's population at the time – in four successive waves.
The Black Death
The Black Death (also known as the Pestilence, the Great Mortality, or the Plague)[a] was the deadliest pandemic recorded in human history. The Black Death resulted in the deaths of up to 75–200 million people in Eurasia and North Africa, peaking in Europe from 1347 to 1351.
Thanks to Wikipedia
The history of smallpox extends into pre-history, with the disease probably emerging in human populations about 10,000 BC. The earliest credible evidence of smallpox is found in the Egyptian mummies of people who died some 3,000 years ago. During the 18th century, the disease killed an estimated 400,000 Europeans each year, including five reigning monarchs, and was responsible for a third of all blindness. During the 20th century, it is estimated that smallpox was responsible for 300–500 million deaths.
Higher grades faster with the top ten skills.
BECOME YOURSELF 2.0
Click the skill title to see the corresponding lessons. Complete a skill with a quiz or checkmark.
1 SKILL A DAY
Gain knowledge and earn badges in just 10 minutes a day, delivered straight to your inbox. Get started
DISCOUNTGet "5 pay for 1" family discount, or ask for school/senior discount here.
Palo Alto, San Francisco, USA Finland - Sweden - Belgium - South Africa
Become member and get a skill overview poster with proven results on skill development.