What are the characteristics of infectious diseases?

Pathogen
Each infectious disease is caused by its specific pathogen, which can be a microbe or a parasite. Including viruses, bacteria, fungi or parasites.

What are the characteristics of infectious diseases?

Contagious
Infectiousness is the main difference between infectious diseases and other types of diseases. Infectious diseases mean that pathogens can be transmitted to others through various channels. The infectious period of infectious disease patients is called the infectious period. Pathogens are excreted from the host, and reach a certain infectious body through certain means, showing a certain contagiousness, and the intensity of infection is related to the type, quantity, virulence, immune status of the susceptible population.

Epidemiological characteristics

1. Epidemiology is divided into strong pathogens and breadths of infectious disease epidemics. Dissemination: refers to the occurrence of infectious diseases in the crowd; epidemic: refers to a region or a unit, the incidence of a certain infectious disease in a certain period of time, exceeding the incidence level of the same period of the previous year; pandemic: refers to An infectious disease spreads and spreads rapidly in a short period of time, exceeding the general epidemic intensity. Outbreaks: refers to a local area or unit that suddenly has many patients with the same disease in a short period of time.

2. Endemic refers to certain infectious diseases or parasitic diseases, in which the host is affected by geographical conditions and changes in temperature conditions, and is often limited to a certain geographical range. Such as insect-borne diseases, natural epidemic diseases.




3. Seasonal refers to the incidence of infectious diseases, which has a seasonal increase during the year. This is related to changes in temperature and humidity.
Immunization after infection

After the infectious disease is healed, the human body is not sensitive to the same infectious disease pathogen, called immunity. Different infectious diseases and post-illness status are different. Some infectious diseases can be immunized for life after one illness, and some can also be infected. Can be divided into the following several infections.

1. Reinfection The same infectious disease is completely cured after a certain period of time, and is infected by the same pathogen.

2. Repeated infection A disease is infested by the same pathogen in the onset. Blood sucking, filariasis, and malaria are the most common.

3. Recurrence The onset of the disease has been transferred to recovery or near recovery, and the pathogen reappears and multiplies, and the original symptoms reappear. Typhoid fever is most common.

4. Reburning Clinical symptoms have been alleviated, but the body temperature has not been normal and has risen again, and the symptoms are aggravated. Found in typhoid fever.
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