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Communicable disease revision - Coggle Diagram
Communicable disease revision
Viral diseases
They can often survive outside a host for long periods of time. When they have infected a suitable host cell or cells, they replicate themselves within the cell thousands of times.
They do not divide and reproduce, but replicate their DNA and protein coats. These are then assembled into new virus particles. The host cell or cells then burst and other nearby cells can be infected with the virus.
Tobacco mosaic virus
It infects the chloroplasts of plant leaves and changes their colour from green to yellow or white in a mosaic pattern. It can also make leaves crinkle or curl up.
This reduces the plant's ability to photosynthesise and grow properly, which reduces the crop yield for farmers.
There is no cure therefore farmers must try to reduce the infection to their crops or attempt to reduce the spread of the virus.
HIV / AIDS
AIDS stands for acquired immune deficiency syndrome. Months or years after the infection of the HIV virus, it becomes active and starts to attack the patient's immune system. HIV at this point has become AIDS.
There is no cure for HIV /AIDS although many scientists are trying to find one. Currently, infected people are given antiviral drugs, which can slow the development of AIDS.
Measles
It is transmitted through the air in tiny droplets after an infected person sneezes. It causes a fever and skin rash.
Many children in developed countries are given vaccines against measles. Infection can cause more serious effects like infertility in adults.
Bacterial diseases
Transmission
Water
Vector
Air
Unhygenic food preparation
Direct contact
Fungal and protist diseases