There are 4 types of seasonal influenza viruses, types A, B, C and D. Influenza A and B viruses are more common when it comes to causing seasonal epidemics of disease.
It is spread from person-to-person through droplets made when someone with flu coughs, sneezes or talks near a person (within 1-metre range).
Seasonal influenza is characterized by a sudden onset of fever, cough (usually dry), headache, muscle and joint pain, severe malaise (feeling unwell), sore throat and a runny nose.
The mode of transmission is through the spread from person-to-person through droplets made when someone with flu coughs, sneezes or talks near a person (within 1-metre range).