Which one is example of cyclopropagative transmission?

In cyclopropagative biological transmission, the disease-producing organism not only reproduces but undergoes cyclical changes in the arthropod as well. Plasmodium spp. and trypanosomes transmitted by mosquitoes and by tsetse flies, respectively, are examples of this type.

What is cyclo development transmission?

Transmission of an arthropod transmitted disease wherein the causal organism undergoes cyclical changes but does not multiply in the body of the arthropod vector.

What are Propagative vectors?

Propagative: When the disease agent undergoes no cyclical change but multiplies in the body of the vector, transmission is said to be propagative, e.g. plague bacilli in rat fleas.

What is mechanical vector transmission?

A mechanical vector picks up an infectious agent on the outside of its body and transmits it in a passive manner. An example of a mechanical vector is a housefly, which lands on cow dung, contaminating its appendages with bacteria from the feces and then lands on food. The pathogen never enters the body of the fly.

What is biological transmission example?

Biological transmission occurs when the vector uptakes the agent, usually through a blood meal from an infected animal, replicates and/or develops it, and then regurgitates the pathogen onto or injects it into a susceptible animal. Fleas, ticks, and mosquitoes are common biological vectors of disease.

What is Propagative transmission mean?

What are Propagative viruses?

Circulative, Propagative Transmission. Circulative, propagative viruses are characterized by replication and systemic invasion of vector insect tissues prior to transmission via salivary glands (Figure 1D) [2,4].

What is an example of mechanical vector?

What is mechanical vector and biological vector?

Biological vectors, such as mosquitoes and ticks may carry pathogens that can multiply within their bodies and be delivered to new hosts, usually by biting. Mechanical vectors, such as flies can pick up infectious agents on the outside of their bodies and transmit them through physical contact.

What is a vector and give an example?

1.2 K. A vector is a physical quantity that has two independent properties such as magnitude and direction. Examples: Force, velocity, displacement, acceleration, etc.

What are vectors used for biology?

​Vector. A vector is any vehicle, often a virus or a plasmid that is used to ferry a desired DNA sequence into a host cell as part of a molecular cloning procedure. Depending on the purpose of the cloning procedure, the vector may assist in multiplying, isolating, or expressing the foreign DNA insert.

What is the difference between propagative and cyclopropagative transmission?

Propagative transmission – pathogen multiplies but no development ex: West Nile virus c. Cyclopropagative transmission – pathogen undergoes development and multiplies ex: Plasmodium spp. – vector is mosquito “malaria” C. Blood feeding arthropods 1. examples a. Mosquito Wuchereia .

What is cyclodevelopmental transmission?

Cyclodevelopmental transmission – parasite undergoes development but NO multiplication ex: Wuchereria bancrofly : in mosquitio  1 mf  L1  L2  L3 b.

How does the number of stages of a parasite change?

There is also another group which does both, increasing the number as well as changing the stage of the parasite (A single miracidium stage of the liver fluke Fasciola hepatica enters a Lymnaea snail vector, It then successively converts into the sporocyst, redia and cercarial stages, with the latter two stages also multiplying in numbers.

What is propagative transmission of disease?

Propagative transmission: When the disease agent or parasite undergoes multiplication within the body of biological vector but no cyclical change is observed, then the trans­mission is said to be propagative. Plague bacillin in rat fleas.

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