gcse biology

Subdecks (12)

What is a pathogen?
A pathogen is a microorganism that may cause disease in its host, such as a bacteria, virus, fungus, or parasite.
How can pathogens spread?
water droplets, direct contact, vectors, through water
how is measles spread?
through physical contact with infected people, through inhalation of water droplets
symptoms of measles 
rash, fevers
how to prevent spreading measles
limit physical contact with other people and if you carry the virus, isolate yourself
how is HIV spread?
sexual contact and exchange of bodily fluids
how to prevent transmitting HIV
Use condoms, not sharing needles, HIV positive mothers bottle feeding baby
how is TMV spread?
through contact between diseased plants and insects act as vectors
symptoms of TMV 
'mosaic' pattern of discolouration on the leaves as the virus destroys the cells
how to reduce spread of TMV 
farmers having good field hygiene and pest control
how is gonorrhoea transmitted?
direct unprotected sexual contact
symptoms of gonorrhoea  
thick yellow/green discharge from genital, painful urination
gonorrhoea preventions