What does it all mean?
COVID-19: A type of coronavirus first reported last December in China which by the end of last month had infected more than 750,000 people in 176 countries and killed more than 36,000, including 17 in Australia.
There is no specific treatment for Covid-19 and scientists in several countries are working to develop a vaccine.
Most people recover on their own but can spread the virus to others while infected.
Coronavirus: Part of a group of related viruses that include Covid-19.
Severe Acute Respiratory Syndrome (SARS): A coronavirus first reported in China in 2002 that infected more than 8000 people in 29 countries (six in Australia) and killed 774 worldwide (none in Australia).
Middle East Respiratory Syndrome (MERS or Camel Flu): A coronavirus first reported in Saudi Arabia in 2012 that infected more than 2500 people in 26 countries and killed more than 500 people (none in Australia).
Virus: A small infectious agent that replicates only inside the living cells of an organism.
Influenza (flu): An infectious disease caused by a virus that spreads by coughing and sneezing or touching contaminated surfaces and then touching the eyes, nose, or mouth.
The 1918 Spanish Flu killed up to 100 million people worldwide, including 15,000 in Australia.
New vaccines are constantly being developed to counter influenza virus mutations.
Cold: A viral disease of the upper respiratory tract that mainly affects the nose.
Colds have similar but less severe symptoms to influenza and are more likely to include a runny nose. There is no vaccine to prevent the common cold.Read more
Bacteria: A type of cell upon which nearly all biological life depends. Bacteria do not cause colds or influenza but can produce secondary lung infections.
Vaccine: a biological preparation that provides artificial immunity to a disease.
There is currently no vaccine for Covid-19.
Pandemic: The worldwide spread of new diseases such as Covid-19.
Quarantine: A period of time or place of isolation – such as a house, ship or hospital – in which people that have arrived from elsewhere or have been exposed to an infectious or contagious disease are placed.
Lockdown: An emergency measure to prevent people from entering or leaving an area such as their town, region or country.