in the course of disease development the period in which

Full Answer

What is the disease cycle?

The disease cycle is a chain of interconnected successive events of a pathogen’s infection in a host plant. It usually coincides with the life cycle of the pathogen with a correlation to its host and the environment.

What is the prodromal stage of disease development?

Once the train leaves the infection station and proceeds through the incubation period, it reaches the next stop or stage of disease development, known as the prodromal period. This is a short stage of disease development where a person begins to feel that they are getting sick.

What is the end result of the disease process?

Ultimately, the disease process ends either in recovery, disability or death. For an infectious agent, infectivity refers to the proportion of exposed persons who become infected. Pathogenicity refers to the proportion of infected individuals who develop clinically apparent disease.

Does the severity and duration of disease progression vary among pathogens?

The severity and duration of the steps in the pattern may vary among pathogens and hosts to some degree, but the overall pattern is similar. Differences in severity and duration of the stages in disease progression are often of diagnostic value.

Which period is the stage of disease during?

There are five stages (or phases) of a disease. (Hattis, 2020). These stages are (1) Incubation period, (2) Prodromal period, (3) Illness period, (4) Decline period, and (5) Convalescence period.

What is the period in disease development between the initial infection and the appearance of the first symptoms?

1. Incubation. The incubation stage includes the time from exposure to an infectious agent until the onset of symptoms.

What are the steps in disease development?

In order for a disease to develop, a pathogen must be present and successfully invade plant host tissues and cells. The chain of events involved in disease development includes inoculation, penetration, infection, incubation, reproduction, and survival (Figure 70).

What are the 4 phases in the course of an infectious disease?

To cause disease, a pathogen must successfully achieve four steps or stages of pathogenesis: exposure (contact), adhesion (colonization), invasion, and infection.

What is latent period?

The latent period of an infectious disease is the time interval between infection and becoming infectious [1]. This can be contrasted with the incubation period, which is the time interval between infection and the appearance of clinical symptoms [1].

What is incubation period in disease?

The incubation period of an infectious disease is the time interval between the exposure to a disease-causing infectious agent and the onset of symptomatic (clinical) disease.

What is acute period?

Acute illnesses generally develop suddenly and last a short time, often only a few days or weeks. Chronic conditions develop slowly and may worsen over an extended period of time—months to years.

What happens during incubation period?

The term “incubation period” describes the time between a virus entering a person's body (infection) and the first appearance of disease symptoms.

What is disease cycle in epidemiology?

This cycle includes phases of growth, consolidation, change of structure, multiplication/reproduction, spread, and infection of a new host. The combination of these phases is called the development of the pathogen.

What are the three phases of infection process?

The different phases in infections include: Infective period. Communicability period.

What is the disease cycle?

The disease cycle is a chain of interconnected successive events of a pathogen’s infection in a host plant. It usually coincides with the life cycle of the pathogen with a correlation to its host and the environment.

How many phases are there in a disease cycle?

Each cycle includes two alternating phases; the parasitic phase and the survival or over-summering or over-wintering phase. The distinct events in a disease cycle are very much important as they provide us information about how and when we should stop the spread of the disease easily.

How many stages of a pathogen are there in plants?

By the time we notice symptoms on plants, the pathogen has already gone through three or four stages unnoticed. Which are: inoculation, incubation, penetration, infection and symptoms. Steps in a disease cycle. Inoculation.

When the inoculum starts procuring nutrients from the susceptible tissues of the host, the infection starts?

Infection. When the inoculum starts procuring nutrients from the susceptible tissues of the host, the infection starts. This is the first stage from where the disease starts to develop. As the pathogen devours soluble products from the cell, various symptoms start appearing.

What is the first contact of a pathogen with its host in a place where infection is possible?

Inoculation . Inoculation is the first contact of a pathogen with its host in a place where infection is possible. The pathogen may be in any of its stages of its life cycle when being inoculated. Most pathogens rely on rain, wind, insects or human to carry them to their host plants. Penetration.

How long can you be in one of the stages of a disease?

We can be in one of the stages of disease for weeks, months, or even years before we progress to the next stage. At any time during the first six stages, if the cause is stopped then the disease subsides and our health returns to normal.

What is the condition where the body is not generating enough energy for the task it must perform?

Enervation: is a condition in which the body either is not generating sufficient energy for the task it must perform or the tasks the body must perform are greater then the normal energy supply can cope with. When this occurs the body becomes impaired and generates even less energy.

What happens when the body is impaired?

When this occurs the body becomes impaired and generates even less energy. When less energy is available for bodily functions, including metabolism, toxins from metabolic waste start to build up in the cells of the body. A small amount of toxins in the body is normal.

Why is fever important?

The heat from fever is necessary to accelerate the elimination of toxins. Fever acts as a catalyst, which causes the toxins to be diluted and pass into the blood stream to the bowels, bladder, lungs and skin for elimination. We can see fever in stages 2-7 of disease.

What is the first step in atrophy?

The first step in atrophy is the body’s inefficiency to burn fat, leading to toxic fat – which is a major organic pollutant– which further inhibits the body from performing its natural function of regeneration of muscle mass and supplying energy.

Is cancer a genetic disease?

Cancer is not primarily genetic. Actually, life is only one thing – a controlled state of disease. If the body controls its constituent systems, one can live a happy and healthy life right up to the time of “natural” death.

What is a timeline in medical terminology?

Description: Timeline shows state of susceptibility, exposure, subclinical disease in which pathologic changes takes place, onset of symptoms, followed by usual time of diagnosis, clinical disease, followed by recovery, disability, or death. Return to text.

What is the stage of subclinical disease?

This stage of subclinical disease, extending from the time of exposure to onset of disease symptoms, is usually called the incubation period for infectious diseases, and the latency period for chronic diseases.

What is a person who is infectious but has subclinical disease called?

Such persons who are infectious but have subclinical disease are called carriers. Frequently, carriers are persons with incubating disease or inapparent infection. Persons with measles, hepatitis A, and several other diseases become infectious a few days before the onset of symptoms.

What is the difference between pathogenicity and infectivity?

For an infectious agent, infectivity refers to the proportion of exposed persons who become infected. Pathogenicity refers to the proportion of infected individuals who develop clinically apparent disease.

What is the definition of virulence?

Virulence refers to the proportion of clinically apparent cases that are severe or fatal. Because the spectrum of disease can include asymptomatic and mild cases, the cases of illness diagnosed by clinicians in the community often represent only the tip of the iceberg.

What is natural history?

Natural history of disease refers to the progression of a disease process in an individual over time, in the absence of treatment. For example, untreated infection with HIV causes a spectrum of clinical problems beginning at the time of seroconversion ...

How long does it take for AIDS to develop?

It is now recognized that it may take 10 years or more for AIDS to develop after seroconversion. ( 43) Many, if not most, diseases have a characteristic natural history, although the time frame and specific manifestations of disease may vary from individual to individual and are influenced by preventive and therapeutic measures.

What is the period of illness?

The Period of Illness. As I mentioned, the prodromal period is quite short and pretty soon progresses to our next stop, called the period of illness. This is the step in the development of a disease where a person feels the typical signs and symptoms associated with the disease.

What is the stage of disease development when a person starts to feel sick?

The Prodromal Period. Once the train leaves the infection station and proceeds through the incubation period, it reaches the next stop or stage of disease development, known as the prodromal period . This is a short stage of disease development where a person begins to feel that they are getting sick.

What happens after a virus enters the body?

After a microbe, such as a virus or bacterium, enters our body without being stopped by our immune system, the incubation period begins. This is the period between infection and the first signs and symptoms associated with a disease. We then enter the prodromal period.

Can you transmit a disease to another person?

In addition, during any period of disease , from the first stop until the very last one where you are no longer experiencing symptoms and signs associated with the disease, you can transmit the disease -causing pathogen to another person.