A vector-borne disease is one in which the pathogenic microorganism is transmitted from an infected individual to another individual by an arthropod or other agent, sometimes with other animals serving as intermediary hosts. The transmission depends upon the attributes and requirements of at least three different living organisms: the pathologic agent, either a virus, protozoa, bacteria, or helminth (worm); the vector, which is commonly an arthropod such as a tick or mosquito; and the human host. In addition, intermediary hosts such as domesticated and/or wild animals often serve as a reservoir for the pathogen until susceptible human populations are exposed.
what is the role of a vector in the spread of a disease
A disease which is carried and spread by an agent (animal or microorganism) is a vector spread disease. Eg. Mosquitoes are the vectors for malaria.
Yes, they can spread bacteria and disease to humans and other animals.
It was a bacterium that caused it, but rats and fleas between them were the vector which spread the disease.
Mosquitoes are the prime vector in the spread of Malaria.Malaria
The vector is the animal, usually an insect, that carries the pathogen without itself being infected. E.g. the Malaria Mosquito.
Tetanus is a disease which can affect any mammal, and mammals spread the disease to other mammals by biting them; hence the vector is mammals. Dogs, foxes and bats are the most usual mammals to be involved.
The vector is how the illness is spread. In cholera's case, the vector is contaminated water. That is how cholera is spread.
Malaria is not communicable between people. It is a vector borne disease that is spread by the female Anopheles mosquito between dawn and dusk.
Vectors play very important role in spread of many diseases. The microorganism spends dominant or recessive stage of it's life cycle. Without the vector the disease can not spread in most of the cases. Malaria and plague are two important vector born diseases.
Vector: Mosquitoes Disease: Malaria
Yes, it is a vector for disease.
A xenodiagnosis is a diagnosis of an infectious disease by exposure to a vector of that disease, incubating the vector and examining it for the presence of that disease.
Polio was spread human-to-human, not by a vector.
A vector. A vector is a disease causing agent. Such as ticks, or mosquitos.
A vector is an animal that transmits disease. For instance the mosquito is a vector for malaria, and ticks are vectors for rocky mountain spotted fever.
the vector carries a disease from person by person eg the mosquito is a vector carrying and spreading the malaria disease
Malaria is a vector based disease and is considered highly communicable, meaning it can be spread, though not easily from human to human. a vector is an organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another.
The mosquito is a carrier of the disease, such as malaria, for instance. As the disease vector, only the mosquito confers disease upon the individual. The person with the disease is not contagious. Interestingly enough, only the female mosquito of the species Anopheles mosquito, confers the disease.
To start.. the reason is evolution, based on the selective pressures that favor the vector's survival. This is not a conscious decision or planned strategy of the bacteria/virus/vector, it is what worked the best and spread the most quickly. What works best has the best reproduction rates and is therefore the most abundant and over time dominates the other strains of a disease. ok. here is the reason and the explaination. Well, the vectors do contract the disease, some human diseases seem to not affect the vector and others will affect the vector especially behavorally (look at rabies). But usually the vector is an insect and the the reason it doesn't affect the life of the vector is understadable. In short, if the disease killed or greatly harmed the main source of distribution it would die out quickly, by leaving the vector relatively unharmed the disease itself has a greater chance to be spread and to reproduce in acceptable areas. The selective pressures involved with high reproduction rates will surely favor those diseases that keep their hosts alive to spread, it can reproduce high amounts inside the human but does not need to in the mosquito and it would make the reproduction of the disease and range of the vector significantly lower. more specific.. When the bacteria or virus is in the vector it is at a different time of the bacteria/virus' lifecycle that allows the vector to live a somewhat normal life. Using malaria as an example... The gametes which are haploid are taken into the mosquito and fuse once in a suitable environment (the mosquito gut in this case) to form a diploid zygote (ookinete)this is the next step in the diseases' life cycle. Now the fused structure burrows into the lining of the gut to migrate to the salivary glands and multiply. Once the mosquito bites another host then the disease is injected with other proteins created by the mosquito intended to keep the wound from closing while feeding. The vector stays alive long enough to spread the disease, and now the disease can multiply rapidly in the human and spread to other mosquitos and then other humans. The mosquito is necessary to the survival and spread of the disease, where as humans are not needed to spread the disease amongst themselfs so it is benefical to reproduce rapidly at the expense of killing the host (because the offspring will be spread even if the host dies).
There is no vector of strep throat. I spread by droplet infection.
A contagion is either a disease spread by contact, the spread of such a disease, or the spread of anything harmful, as if it were a disease.
two diseases spread by the activity of a vector
A vector-borne disease.