viral diseases

Give 3 examples of viral diseases

Measles

HIV

Tobacco mosaic virus

How does measles spread and what are the symptoms

Measles spread by droplets when an infected persons needs or coughs measles generally cause people to develop a red rash across their body and fever.

What can measles lead to how serious is measles

Measles can be very serious or even fatal if there are complications measles can sometimes lead pneumonia or a brain infection called encephalitis

How does HIV spread and what are the symptoms

HIV spreads by sexual contact or by exchanging bodily fluids(by sharing needles)

When someone gets HIV, they develop flu like symptoms (fever, tiredness) but then they will start to feel better but the virus will still be damaging immune system so may start to catch unusual infections or develop cancers at this point. Someone is said to develop AIDS (a disease- immune system can’t cope)

How can HIV be controlled

What happens if immune system is badly damaged

HIV can be controlled with Antiretroviral drugs. These stop the viruses replicating in the body. The virus attack attacks their immune system.

If you put the bodies immune system is badly damaged it can’t cope with other infections or cancers at this stage. The virus is known as AIDS

What does tobacco mosaic virus affect and what are symptoms and what problem does it cause for plants

Tobacco mosaic viruses affect plants: tomatoes, tobacco. It this colours patches on leaves causing a mosaic pattern to form.

The problem it causes for plants is that photosynthesis can’t occur in discoloured patches so not enough sugars for growth (are produced )