GCSE AQA COMMUNICABLE DISEASES QUESTION AND
ANSWERS LATEST UPDATE
What are three examples of viral diseases?
Measles , HIV and TMV.
How does someone become infected with HIV?
It can be sexually transmitted, from blood, from mother to child and breast milk, needle
sharing and blood transfusions.
What are the symptoms for HIV?
Flu-like illness
Immune System damaged
Weakness in immune system leads to increase in infections and Cancers
How is HIV treated?
People have to take regular use of antiretroviral drugs which can give them an almost
normal life expectancy
How are HIV and AIDS different?
AIDS is a condition while HIV is a virus. HIV leads to AIDS which is like the final stage
of HIV when the immune system is very weak.
How can HIV be prevented?
Use condoms (not just any contraception!), not sharing needles, screening blood of
transfusions. HIV+ mothers should bottle-feed their children.
How is measles transmitted?
through sneezes and coughs through the droplets; airborne particles inhaled by others.
What are symptoms of measles?
High fever, runny nose, cough, rash. In worst cases, can lead to deafness and eye
infections.
How is the spread of measles prevented?
Vaccination of babies so they develop an immunity
How is measles treated?
There is no treatment. The body's immune system overcomes it after a couple of weeks.
What is TMV?
Tobacco Mosaic Virus
How is TMV transmitted?
Via contact between plants, and insect vectors.
What are the symptoms of TMV?
A mosaic pattern of discolouration on leaves which reduces growth due to a lack of
photosynthesis
Why does TMV reduce growth?
Discoloration is due to a reduction in chlorophyll.
Reduced chlorophyll means less photosynthesis occurs, so less glucose is produced.
Glucose is needed for growth (respiration), so growth is reduced.
How can TMV be prevented?
Selective breeding of plants with a resistance to this disease can be grown.
ANSWERS LATEST UPDATE
What are three examples of viral diseases?
Measles , HIV and TMV.
How does someone become infected with HIV?
It can be sexually transmitted, from blood, from mother to child and breast milk, needle
sharing and blood transfusions.
What are the symptoms for HIV?
Flu-like illness
Immune System damaged
Weakness in immune system leads to increase in infections and Cancers
How is HIV treated?
People have to take regular use of antiretroviral drugs which can give them an almost
normal life expectancy
How are HIV and AIDS different?
AIDS is a condition while HIV is a virus. HIV leads to AIDS which is like the final stage
of HIV when the immune system is very weak.
How can HIV be prevented?
Use condoms (not just any contraception!), not sharing needles, screening blood of
transfusions. HIV+ mothers should bottle-feed their children.
How is measles transmitted?
through sneezes and coughs through the droplets; airborne particles inhaled by others.
What are symptoms of measles?
High fever, runny nose, cough, rash. In worst cases, can lead to deafness and eye
infections.
How is the spread of measles prevented?
Vaccination of babies so they develop an immunity
How is measles treated?
There is no treatment. The body's immune system overcomes it after a couple of weeks.
What is TMV?
Tobacco Mosaic Virus
How is TMV transmitted?
Via contact between plants, and insect vectors.
What are the symptoms of TMV?
A mosaic pattern of discolouration on leaves which reduces growth due to a lack of
photosynthesis
Why does TMV reduce growth?
Discoloration is due to a reduction in chlorophyll.
Reduced chlorophyll means less photosynthesis occurs, so less glucose is produced.
Glucose is needed for growth (respiration), so growth is reduced.
How can TMV be prevented?
Selective breeding of plants with a resistance to this disease can be grown.
