How Do I Get West Nile Virus?

Generally speaking, people develop West Nile Virus when bitten by an infected mosquito.  When the mosquito inserts its proboscis (see images below) through your skin, a small amount of saliva is injected.  Compounds in saliva prevent your blood from clotting, making it easier for the mosquito to feed on your blood.  Unfortunately, this small amount of saliva may contain tiny viruses, like West Nile Virus.  

Highly magnified and labeled diagram of a mosquito's head and mouthparts as it feeds on human skin. The mosquito's compound eyes, antennae, and six needle-like mouthparts are visible. Two mouthparts pierce the skin to inject saliva and draw blood, while others guide or support the feeding process. The image includes detailed labels describing each component and its function, including references to the mosquito's ability to sense heat and carbon dioxide. A smaller inset image compares the mosquito's size to a pinhead.
A close-up of a mosquito feeding on human skin, showcasing its detailed body and legs.
The image shows a close-up of a mosquito feeding on skin, highlighting its features and anatomy.
A close-up of a mosquito on human skin, highlighting its features and size.
Highly magnified and labeled diagram of a mosquito's head and mouthparts as it feeds on human skin. The mosquito's compound eyes, antennae, and six needle-like mouthparts are visible. Two mouthparts pierce the skin to inject saliva and draw blood, while others guide or support the feeding process. The image includes detailed labels describing each component and its function, including references to the mosquito's ability to sense heat and carbon dioxide. A smaller inset image compares the mosquito's size to a pinhead.
A close-up of a mosquito feeding on human skin, showcasing its detailed body and legs.
The image shows a close-up of a mosquito feeding on skin, highlighting its features and anatomy.
A close-up of a mosquito on human skin, highlighting its features and size.