What Is The Meaning Of Transovarial Transmission?

Transgenerational transmission normally occurs transovarially (through the ovaries) after the parasites infect the ovarian germinal tissue and then are transmitted transstadially to the next reproductive or blood-feeding stage.

What is the meaning of Transovarial?

Medical Definition of transovarial

: relating to or being transmission of a pathogen from an organism (as a tick) to its offspring by infection of eggs in its ovary.

Is Transovarial transmission a type of vertical transmission?

Transovarial transmission, or vertical transmission, is the spread of a pathogen from parent to offspring. It has been observed that some mosquito-borne viruses can be transmitted from female mosquitoes to their offspring during follicle development or during oviposition.

What is Transovarial transmission quizlet?

Transovarial or transovarian transmission (transmission from parent to offspring via the ovaries) occurs in certain arthropod vectors as they transmit pathogens from parent arthropod to offspring arthropod.

What is the Transovarial transmission of causative agents of diseases?

Transovarial transmission (TOT), the transmission of an infectious agent from parent to offspring via infection of the developing egg which subsequently results in infectious adult arthropods, is an important transmission mechanism among viruses in the order Bunyavirales.

What is Propagative transmission?

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 disease transmission?

Mechanical transmission of disease.

Mechanical transmission of disease pathogens occurs when a vector transports organisms, such as bacteria that cause dysentery, on its feet, body hairs and other body surfaces to the host. There is no multiplication or development of the pathogen within the vector’s body.

What is vertical contact transmission?

Vertical transmission: Passage of a disease-causing agent (pathogen) from mother to baby during the period immediately before and after birth. Transmission might occur across the placenta, in the breast milk, or through direct contact during or after birth.

What is Interstadial transmission?

Transstadial Transmission – nymphal acquisition-adult transmission (also known as interstadial transmission); and ii. Intrastadial Transmission – adult acquisition-adult transmission by males and/or partially fed females moved between hosts and allowed to reattach and continue feeding.

What is Stercorarian?

The so-called ‘stercorarian’ transmission, sometimes considered as the ancestor of salivarian transmission , occurs through the contact of vector’s feces and the biting wound (or a mucosa). Successful transmission requires an extraordinary combination of somewhat unlikely events.

What causes tick borne encephalitis virus?

Tickborne encephalitis is caused by a virus (Flavivirus genus, family Flaviviridae) which includes three subtypes: European subtype, transmitted by Ixodes ricinus ticks, endemic in rural and forested areas of central, eastern and northern Europe; Far eastern subtype, transmitted mainly by I.

What is enzootic cycle?

Scientists think that plague bacteria circulate at low rates within populations of certain rodents without causing excessive rodent die-off. These infected animals and their fleas serve as long-term reservoirs for the bacteria. This is called the enzootic cycle.

What are the mode transmission of mosquitoes?

Mosquitoes spread disease through their bite. Mosquitoes are vectors (living things that carry diseases between animals and humans). Vectors often carry infections through blood.

What is direct transmission?

In direct transmission, an infectious agent is transferred from a reservoir to a susceptible host by direct contact or droplet spread. Direct contact occurs through skin-to-skin contact, kissing, and sexual intercourse.

What is the difference between mechanical and biological transmission?

The basic difference between biological transmission and mechanical transmission is that in biological transmission, the agent develops and/or propagates within the vector, while in mechanical transmission, the simple transfer of agents from one infected host or a contaminated substrate to a susceptible host occurs.

What is a mechanical vector transmission?

Vector-borne Exposure

Mechanical transmission means that the disease agent does not replicate or develop in/on the vector; it is simply transported by the vector from one animal to another (flies).

What is droplet transmission?

Droplet transmission occurs when bacteria or viruses travel on relatively large respiratory droplets that people sneeze, cough, or exhale. They travel only short distances (usually less than 2 meters) before settling.

What is Propagative?

adj. Of, relating to, or involved in propagation. Relating to the germ cells of an animal or plant as distinguished from the somatic cells.

What is a Propagative vector?

Propagative Transmission. The parasite multiplies within the vector without any cyclical changes, i.e., the parasite increases in number within the vector but does not undergo any developmental changes.

What is the cyclo Propagative 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 high vector competence?

Vector competence is defined as “the ability of a vector to transmit a disease” . It normally comprises the capacity of a vector to be infected, maintain and transmit an infectious agent.

How is Rickettsia transmitted?

Most rickettsial organisms are transmitted by the bites or infectious fluids (such as feces) inoculated into the skins from ectoparasites such as fleas, lice, mites, and ticks. Inhaling bacteria or inoculating conjunctiva with infectious material may also result in infection.

What is iatrogenic transmission?

Iatrogenic transmission of infectious disease refers to the spread of a pathogen, (bacteria or virus) through a medical procedure or treatment such as a blood transfusion, reuse of needles or IV sets, or by touching a wound on an infected horse and then handling another horse.


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