4. Human infection with avian influenza (H7N9)
What it is: According to the CDC, human infections with an Asian lineage of avian influenza virus were first reported in 2013 in China. Most cases of human infection with avian influenza occurred after exposure to poultry.
How is it contracted? It is contracted through infected birds and poultry.
Signs and symptoms: Most of the people who contracted H7N9 displayed serious respiratory illness symptoms. The first symptoms often include fever and flu-like symptoms such as body aches and headache. Other possible symptoms include diarrhoea, nausea and vomiting.
When and where: H7N9 in humans was reported in October 2017 in China by the WHO.