What is pathogenicity in biology?
Aug 09, 2022, 16:45 IST
Pathogenicity can be explained as the absolute ability of an infectious agent to cause disease in a host an infectious agent is either pathogenic or not.
Of all the communicable diseases caused by protozoans, malaria is the most destructive to humans. It is widespread in tropics, subtropics and certain areas in the temperate zone.
Plasmodium vivax causes benign tertian or vivax malaria. It is characterized by the recurrence of fever every third day i.e. after every 48 hours (the period of erythrocytic schizogony in P. vivax). Its incidence (chance of occurrence) is worldwide especially in the temperate regions.
Malarial symptoms appear several days after the infection of man by the sporozoite. This time interval or the incubation period is utilized by the parasite to increase its progeny or daughter population. It is a must, for the malarial symptoms to appear, that a large number of organisms continue erythrocytic cycle simultaneously. Each episode of pyrexia or fever exhibits 3 successive stages.
a) Cold state
It is occurs at the onset of malaria fever and is characterized by the chills and rigors. It lasts for about 20 minutes to 1 hour.
b) Hot or febrile stage
As the cold stage subsides, the body temperature rises as high as . The patient feels very hot with severe headache. Its duration is one to four hours.
c) Sweating stage
As the temperature subsides, the patient sweats profusely. Eventually, the fever disappears and the patient is comfortable until the next episode which occurs at regular intervals of 48 hours in a case of P. vivax malaria. Depending on the Plasmodium spp. the total duration of paroxysm varies from 6 to 10 hours.
Malaria fever appears due to the release of haemozoin (malaria pigment) in the blood plasma, simultaneous to the liberation of merozoites owing to the rupture of schizonts within the erythrocytes. The rupture of schizonts tends to be synchronous i.e. they all burst at the same point of time. Haemozoin is toxic as it induces high fever and shivering.For More Biology Doubts check out Physics Wallah Biology Doubts sections.
Anaemia is unavoidable in cases of infection with Plasmodium spp. In chronic or long standing cases, hepatosplenomegaly (abnormal enlargement of liver & spleen) is observed. The bone marrow turns blue.
P.falciparum infection is also known as ‘black water fever’ as it is characterized by the massive destruction of erythrocytes followed by the excretion of liberated haemoglobin in the patient’s urine.
What is pathogenicity in biology? pdf
- Explain types of Root
- Define Parts of Angiosperm plants
- Explain about leaf
- What is Phyllotaxy
- What is Inflorescence
- Define parts of flower
- Define Placentation
- Explain about types and parts of fruits
- Define seed and its parts
- What is Interaction of genes
- Heredity definition biology
- what is Chromosomes
- What is genes
- What are the linked genes?
- Embryonic development
- Cleavage versus typical mitosis
- structure and function of Placenta
- Structure and functions of Nucleus
- Environmental pollution
- Biogeochemical cycle
- About Algae
- What is Biodiversity
- Types of soil
- Difference between animal cell and Plant Cell
- what is Diffusion and Osmosis
- Differentiate between Xylem and Phloem
- Energy flow in ecosystem
- Life Process
- What is Xylem Tissue
- structure of stem
- Tissue System
- internal structure of leaf
- what are different Types of microscopes
- What is Chromatography-
- What is Cell compartmentation
- Structure of cell wall
- Golgi Complex
- what are the functions of Mitochondria?
- Types of Pesticides
- Biological methods of Pest control
- Animal tissues and their functions
- What is Gametophyte?
- Animal classification system
- why is genetic variation important ?
- Classification Of Plant Kingdom
- Branches of Ecology
- Types Of Parasitism
- The Different Types Of Microscopes And Their Uses
- Chromosome Theory Of Inheritance?
- The Different Parts Of A Fruit
- the Branches of Biology and Zoology ?
- Phylum Protozoa General Characters And Classification
- Difference Between Population And Biotic Community?
- Characteristics of Roots
- The Classification Of Meristematic Tissue
- The Food Chain Work
- What is reproduction and its two types?
- Types Of Racemose Inflorescence
- The Systems Of Biological Classification
- Types Of Biodiversity
- Greenhouse Gases Affect The Environment
- Glands And Its Types?
- Types Of Ovules
- Protostomic and Deuterostomic
- What is pleiotropy in biology?
- The branches of botany?
- Father of some important branches of biology
- What are the types of animal adaptations ?
- What is pathogenicity in biology?
- What is human genetics?
- What is the edible part of most fruits?
- Function of chromatography
- What are the differences between cilia and flagella?
- What is a negative interaction?
- Characteristics of Roots
- What Is the Difference Between Sapwood and Heartwood?
- What are the characteristics of a lake?
- What is Amoebocytes function?
- Describe The Different Types Of Corolla
- What is the most important function of a family?
- Threats To Biodiversity
- What is water pollution causes and effects?
- Who proposed five kingdom classification?
- Gram positive and Gram negative bacteria
- Comparison between chordates and non chordates
- The difference between agnatha and gnathostomata?
- What is vegetative reproduction in plants?
- What is a simple definition of fungi?
- What do you mean by organic evolution?
- What are the characteristics of being human?
- What is cardiac cycle explain?
- What are the abnormal components of urine?
- What are the functions of vertebrates?
- What are examples of glucocorticoids?
- what is difference between diffusion and facilitated diffusion?
- What is opening and closing of stomata?
- What are the characteristics of green algae?
- What is special about red algae?
- What are the common poultry diseases?
- What is cancer biology?
- The difference between a turtle and a tortoise?
- How can you identify a poisonous snake?
- What is the difference between Cam c3 and c4 plants?
- What is the difference between photosystem I and photosystem II quizlet?
- What Are Viruses and characteristics of viruses?
- What are viral diseases?
- What is Bryophyte in biology?
- What are the uses of bryophytes?
- The differences between aerobic and anaerobic respiration?
- The purpose of the pentose phosphate pathway?
- The macro and micro elements needed by plants?
- What is the function of Gametophyte?
- The life cycle of Pteridophytes
- What is seed habit in Pteridophytes?
- What is pteridophyta in biology?
- What is the function of gymnosperms?
- What is the Economic Importance of Gymnosperms?
- What is Photoperiodism classify the plants based on Photoperiodism?
- What is plant growth and development?
- What is Asexual reproduction
- Sexual Reproduction in flowering plants
- Excretion-Overview Definition Example and Functions
- Urine Composition
- Circulatory System