COVID-19
Reasons
Treatments
Effects
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Due to globalisation, the virus could spread rapidly. 
Older adults are most at risk of severe illness, as are people with the chronic health conditions
The COV-19 virus reportedly attaches itself to droplets which are emitted when infected people sneeze or cough.
The virus emerged at the Wuhan live animal market
The virus spreads from person to person
It can cause symptoms that become severe, leading to death in some cases.
Lots of jobs disappeared
Travelling to foreign countries was prohibited
Digital education was a interesting experience
Masks were mandatory to everyone
Most of the people had too much free time
Lockdowns were introduced to stop the virus
Vaccination
Oxygen for severely ill patients
These are not treatments but they can prevent the virus from spreading
Wearing masks
Using hand sanitizers
Keeping distance from other people
Mental health is also important
Geographical factors
China is a densely populated country. So it could spread really quick.
Due to the globalisation every country is accessible easily. This helps the virus to spread quickly.