Scarlet Fever: Cause and Transmission - Streptococcus Pyogenes

The vector for scarlet fever is not a vector as such. Scarlet fever is caused by bacteria called Streptococcus pyogenes, commonly known as group A streptococcus (GAS). This bacterium usually enters the body through the mouth or nose, and can spread through direct contact with respiratory droplets or through contact with infected surfaces or objects.