CU254 causes and spread of infection
CU254
Causes and spread of infection.
1.1
Viruses are pieces of nucleic acid wrapped in a thin coat of protein that replicate only within cells of living host.
Bacteria are one cell micro-organisms with simple cellular organizations whose nucleus lacks a membrane.
Parasites may be protozoa, yeast or multi cellular organisms such as fungi or worms that live in or on a host to obtain nourishment without providing any benefit to the host.
Fungi there are many different varieties of fungi, and we eat quite a few of them. Mushrooms are fungi, as is mould that forms the blue or green veins in some types of cheese. And yeast, another type of fungi, is a necessary ingredient to make most types of bread.
1.2
Fungi: - athletes foot.
Virus: - AIDS
Bacteria: - salmonella, E.coli.
Parasites: - Lyme disease, scabies, malaria.
1.3
Infection begins when an organism successfully colonizes by entering the body, growing and multiplying.
Most humans are not easily affected. Those who are weak, sick, and malnourished, have cancer or are diabetic have increased chances to chronic or persistent infections.
Individuals who have suppressed immune system are particularly susceptible to opportunistic infections. Entrance to the host generally occurs through the mucosa in orifices like the oral cavity, nose, eyes, gentitalia, anus, or open wounds, while a few organisms can grow at the initial site of entry. Many migrate and cause systemic infection in different organs; some pathogens grow within the host cells (intracellular) whereas others grow freely in bodily fluids.
1.3
A systemic infection is generally more serious, it can include things like Lyme disease, aids, tuberculosis. It can also be a chest or urinary tract infection, depending how serious it gets.
What separates a systemic infection to a localised infection is that for it to be a systemic infection the bacteria or virus must enter the blood stream.
When bacteria or viruses are in the bloodstream there is
Causes and spread of infection.
1.1
Viruses are pieces of nucleic acid wrapped in a thin coat of protein that replicate only within cells of living host.
Bacteria are one cell micro-organisms with simple cellular organizations whose nucleus lacks a membrane.
Parasites may be protozoa, yeast or multi cellular organisms such as fungi or worms that live in or on a host to obtain nourishment without providing any benefit to the host.
Fungi there are many different varieties of fungi, and we eat quite a few of them. Mushrooms are fungi, as is mould that forms the blue or green veins in some types of cheese. And yeast, another type of fungi, is a necessary ingredient to make most types of bread.
1.2
Fungi: - athletes foot.
Virus: - AIDS
Bacteria: - salmonella, E.coli.
Parasites: - Lyme disease, scabies, malaria.
1.3
Infection begins when an organism successfully colonizes by entering the body, growing and multiplying.
Most humans are not easily affected. Those who are weak, sick, and malnourished, have cancer or are diabetic have increased chances to chronic or persistent infections.
Individuals who have suppressed immune system are particularly susceptible to opportunistic infections. Entrance to the host generally occurs through the mucosa in orifices like the oral cavity, nose, eyes, gentitalia, anus, or open wounds, while a few organisms can grow at the initial site of entry. Many migrate and cause systemic infection in different organs; some pathogens grow within the host cells (intracellular) whereas others grow freely in bodily fluids.
1.3
A systemic infection is generally more serious, it can include things like Lyme disease, aids, tuberculosis. It can also be a chest or urinary tract infection, depending how serious it gets.
What separates a systemic infection to a localised infection is that for it to be a systemic infection the bacteria or virus must enter the blood stream.
When bacteria or viruses are in the bloodstream there is