Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites.
Many organisms live in and on our bodies.
They’re normally harmless or even helpful.
But under certain conditions, some organisms may cause disease.
What are the 4 types of diseases?
There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic diseases and non-genetic hereditary diseases), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases.
How do diseases affect humans?
Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease occurs when the cells in your body are damaged as a result of infection and signs and symptoms of an illness appear. Pathogenic microbes challenge the immune system in many ways.
What are the diseases caused by bacteria?
- Infectious disease.
What are the 5 most common infectious diseases?
The 5 Most Common Infectious Diseases
- Hepatitis B. According to current statistics, hepatitis B is the most common infectious disease in the world, affecting some 2 billion people — that’s more than one-quarter of the world’s population.
- Hepatitis C.
What are the six diseases?
Childhood mortality: six killer diseases and how to stop them
- Pneumonia. Pneumonia, usually caused by a bacterial infection, is a disease in which the air sacs in the lungs become inflamed and fill up with fluid.
- Diarrhoea. Diarrhoea is caused by an infection in the intestinal track.
Are diseases curable?
The term “cure” means that, after medical treatment, the patient no longer has that particular condition anymore. Some diseases can be cured. Others, like hepatitis B, have no cure. The person will always have the condition, but medical treatments can help to manage the disease.
What do viruses do to your body?
Viruses are very tiny germs. They invade living, normal cells and use those cells to multiply and produce other viruses like themselves. This can kill, damage, or change the cells and make you sick. Different viruses attack certain cells in your body such as your liver, respiratory system, or blood.
How long can a virus stay in your body?
The effects will last as long as the virus affects the body. Most viral infections last from several days to 2 weeks. Mononucleosis may last longer. Virus infections can be more serious for older adults.
How do viruses infect the body?
A viral infection is a proliferation of a harmful virus inside the body. Viruses cannot reproduce without the assistance of a host. Viruses infect a host by introducing their genetic material into the cells and hijacking the cell’s internal machinery to make more virus particles.
What are 5 diseases caused by bacteria?
- Infectious disease.
What is the strongest antibiotic for bacterial infection?
Drugs Used to Treat Bacterial Infection
|Drug name||Rx / OTC||Rating|
|Generic name: metronidazole systemic Drug class: amebicides, miscellaneous antibiotics For consumers: dosage, interactions, side effects For professionals: AHFS DI Monograph, Prescribing Information|
|Azithromycin Dose Pack||Rx||7.0|
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What does a bacterial skin infection look like?
Bacterial skin infections often begin as small, red bumps that slowly increase in size. Some bacterial infections are mild and easily treated with topical antibiotics, but other infections require an oral antibiotic. Different types of bacterial skin infections include: cellulitis.