Infection can be defined as the injurious colonization of a host organism, by a foreign species. In such a case, the foreign species, which can also be called the infecting organism, starts utilization of the resources of the host. The result is that the normal functioning of the host is adversely affected. In human beings, the negative effects might manifest themselves in the form of chronic wounds, loss of an infected limb, gangrene and, in some cases, even death. The foreign species usually comprise of microscopic organisms like bacteria, viruses, parasites, fungi, prions, viroids, and so on.
General Infections
General infections can be divided into two categories, namely systemic infection and local infection. To know more about both of them, read on.
Systemic Infection
The cause of a systemic infection comprises of bacteria or virus. The main characteristic of such an infection is that it affects the bloodstream of an individual, with the result that the symptoms spread to the whole of the body. The most common examples of a systemic infection are cold, flu, mononucleosis, strep throat, etc.
Signs and Symptoms of Systemic Infection
The following signs and symptoms usually accompany a systemic infection:
- Aches
- Chills
- Fever
- Nausea
- Vomiting
- Weakness
Local Infection
A local infection can be explained as that infection which does not affect the whole body of an individual. Rather, it is limited to a specific portion of the body. It does not attack the bloodstream and is limited to the outer surface of the body. Some of the most common examples of a local infection include an infected wound, an infected cut, etc.
Signs and Symptoms of Local Infection
The following signs and symptoms usually accompany a local infection:
- Fever (the only systemic symptom caused by a local infection)
- Foul Odor Discharge
- Heat at the Site
- Pain
- Pus
- Redness
- Swelling
