Types of Diseases

fungal disease

rose black spot causes purple or black spots to develop on leaves which turn yellow and fall off

means less photosynthesis can happen so the plant doesn't grow well

spreads through the wind or in water

can be treated by fungicides and by removing affected leaves which are then destroyed so it cant spread

caused by a protist

malaria is caused by protist

mosquitos pick up the malaria protist when they feed on an infected animal

every time the mosquito feeds on another animal it infects it by inserting the protist into the animals blood vessels

it can be fatal and causes repeating episodes of fever

can be reduced by stopping the mosquito from breeding and people can use mosquito nets and insecticides

bacterial diseases

salmonella

salmonella is a type of food poisoning

causes fever, stomach cramps, vomiting and diarrhoea

caused by the toxins the bacteria produces

get it from eating food which is contaminated with salmonella bacteria

in the UK most poultry is vaccinated against the disease to control it

gonorrhoea

a sexual transmitted disease

caused by bacteria

causes pain whilst urinating, thick yellow or green discharge from the vagina or penis

was originally treated by penicillin but is harder now as bacteria has become resistant to it

people can be treated by antibiotics and should use barrier methods of contraception

reduced or prevented

being hygienic - prevents the spread of disease e.g. washing hands before preparing food or after sneezing

destroying vectors - by getting rid of the organisms that spread disease e.g. using insecticides or destroying habitat so they cant breed

isolating infected individuals - if they are isolated it prevents them from passing it on

vaccination - this means they cant develop the disease and therefore pass it on