West Nile virus: How the virus spreads

The video explains how infected birds spread the West Nile virus through mosquitoes, which can then transmit it to horses and humans, who are dead-end hosts. In severe cases, the virus can lead to serious health conditions like encephalitis, meningitis, meningoencephalitis, and poliomyelitis.

How do infected birds contribute to the spread of the West Nile virus?

• By contaminating water sources

• By spreading it through the air

• By migrating to new areas and being bitten by mosquitoes

• By directly infecting humans

What role do mosquitoes play in the transmission of the West Nile virus?

• They are the primary carriers that spread the virus to other animals

• They are immune to the virus

• They only spread the virus among birds

• They do not play any role in the transmission

Why are horses and humans considered dead-end hosts for the West Nile virus?

• They do not transmit the virus back to mosquitoes

• They do not show any symptoms of the virus

• They are immune to the virus

• They can transmit the virus back to mosquitoes

Which of the following is a possible severe condition caused by the West Nile virus?

• Common cold

• Encephalitis

• Diabetes

• Hypertension

What is meningitis in the context of West Nile virus complications?

• An inflammation of the brain

• An inflammation of the membrane around the brain and spinal cord

• An inflammation of the liver

• An inflammation of the lungs