Viral Diseases

Question 1

What are the 3 viral diseases

Answer 1

Measles
HIV
TMV

Question 2

What is measles

Answer 2

Spread by inhalation of droplets from an infected person’s sneeze or cough
they develop a red skin rash, fever
Can be fatal if there are complications
Can lead to pneumonia (lung infection)
Most people are vaccinated against it when young

Question 3

What is HIV

Answer 3

Spread by sexual contact, exchanging bodily fluids such as blood
This can happen when sharing needles
Causes flu like symptoms for a few weeks, usually the person doesn’t experience any symptoms for years and during this time HIV can be controlled with antiretroviral drugs
The virus attacks immune cells

Question 4

How do antiretroviral drugs stop HIV

Answer 4

Stop virus replicating

Question 5

What happens when the body’s immune system is badly damaged by HIV

Answer 5

it can’t cope with other infections or cancers, this stage the virus is called AIDS

Question 6

What is tobacco mosaic virus (TMV)

Answer 6

Affects species of plants. Eg tomatoes
It causes a mosaic pattern on the leaves and parts become discolored
The discoloration means the plant can’t carry out photosynthesis properly so it affects growth too