What Are The Three Components Of The Disease Triangle?

What is simple interest Disease?

Simple interest, or monocyclic diseases, were ones that increased mathematically — similar to simple interest on money.

Monocyclic diseases develop one generation of infection and rarely does secondary infection occur during the season..

What are the 3 major types of epidemiological studies?

Three major types of epidemiologic studies are cohort, case-control, and cross-sectional studies (study designs are discussed in more detail in IOM, 2000). A cohort, or longitudinal, study follows a defined group over time.

What is disease triangle?

The disease triangle is a conceptual model that shows the interactions between the environment, the host and an infectious (or abiotic) agent. This model can be used to predict epidemiological outcomes in plant health and public health, both in local and global communities.

What is disease cycle?

Abstract. AbstractPlant disease cycles represent pathogen biology as a series of interconnected stages of development including dormancy, reproduction, dispersal, and pathogenesis. The progression through these stages is determined by a continuous sequence of interactions among host, pathogen, and environment.

What is Polyetic disease?

Epidemics that occur under these conditions are referred to as polyetic epidemics and can be caused by both monocyclic and polycyclic pathogens. Apple powdery mildew is an example of a polyetic epidemic caused by a polycyclic pathogen and Dutch Elm disease a polyetic epidemic caused by a monocyclic pathogen.

How are disease spread?

Through blood or other body fluids Some infections are spread when body fluids such as blood, saliva, urine (wees), faeces (poos) or semen come into direct contact with an uninfected person through kissing, sexual contact or through a needlestick injury. Examples of diseases spread through body fluids: hepatitis B.

What are the factors affecting disease development?

Environmental factors affecting disease development Important environmental factors that may affect development of plant diseases and determine whether they become epiphytotic include temperature, relative humidity, soil moisture, soil pH, soil type, and soil fertility.

What are the 3 factors that cause disease?

Infectious diseases can be caused by:Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.Fungi. … Parasites.Jul 17, 2019

What are the five signs of an infection?

Know the Signs and Symptoms of InfectionFever (this is sometimes the only sign of an infection).Chills and sweats.Change in cough or a new cough.Sore throat or new mouth sore.Shortness of breath.Nasal congestion.Stiff neck.Burning or pain with urination.More items…

How can we prevent plant diseases?

Prevent Plant Diseases With Good Gardening PracticesFollow Good Sanitation Practices.Fertilize to Keep Your Plants Healthy.Inspect Plants for Diseases Before You Bring Them Home.Allow the Soil to Warm Before Planting.Ensure a Healthy Vegetable Garden By Rotating Crops.Water in the Morning.Mulch!More items…•Sep 17, 2020

What is the best definition for the epidemiological triangle?

Epidemiologists use a tool to help understand infectious disease known as the epidemiologic triangle. The epidemiologic triangle is a model for explaining the organism causing the disease and the conditions that allow it to reproduce and spread.

What are the stages of disease development?

The five periods of disease (sometimes referred to as stages or phases) include the incubation, prodromal, illness, decline, and convalescence periods (Figure 2).

What are the three major factors involved in the development of disease in plants?

Plant diseases– their occurrence and severity– result from the impact of three factors: the host plant, the pathogen, and the environmental conditions. This is represented with the disease triangle. If any one of the three factors is missing, the triangle is not complete, no disease will occur.

Which plant disease is caused by fungus?

Some fungal diseases occur on a wide range of vegetables. These diseases include Anthracnose; Botrytis rots; Downy mildews; Fusarium rots; Powdery mildews; Rusts; Rhizoctonia rots; Sclerotinia rots; Sclerotium rots.

What are the 5 W’s of epidemiology?

The difference is that epidemiologists tend to use synonyms for the 5 W’s: diagnosis or health event (what), person (who), place (where), time (when), and causes, risk factors, and modes of transmission (why/how).

What are the 4 types of infections?

This article will focus on the most common and deadly types of infection: bacterial, viral, fungal, and prion.

What are the classification of plant diseases?

According to this criterion, plant diseases are classified into two types: infectious (biotic) diseases, which are caused by eukaryotes, prokaryotes, parasitic higher plants, viruses/viroids, nematodes, and protozoa, and noninfectious (abiotic) diseases, which are caused by different extreme environmental conditions [5 …

What is epidemiological triangle?

The Epidemiologic Triangle, sometimes referred to as the Epidemiologic Triad, is a tool that scientists use for addressing the three components that contribute to the spread of disease: an external agent, a susceptible host and an environment that brings the agent and host together.