Any parasite can spread disease. Mosquitoes, ticks, flees and lice are the most common.
Many insects spread disease when they feed on animals, there include (but aren't limited to) ticks fleas, mosquitos, bed bugs tsetse flies, kissing bugs. lice
Mosquitoes
THE MOSQUITO
Vultures eat dead, rotting carcasses. By doing so, the reduce the spread of disease. That helps all animals, including zebra. Then, when a zebra dies, vultures eat it, too.
Several spread disease organisms when feeding on blood- fleas, ticks and mosquitos are 3 that come to mind.
Still others are spread by eating the flesh of infected animals. Tapeworms are spread this way. Other diseases are spread by insect vectors. An insect, such as a flea or tick, feeds on an infected animal, then feeds on a human.
Diseases can more easily spread to other animals Also the spread of parasites as well
The female Anopheles mosquito. The mosquito spreads viruses such as those that lead to malaria, yellow fever and dengue fever, as a byproduct of injecting its anti-coagulant saliva into the bodies of its victims before starting to feed. Bats, including vampire bats, have also been known to spread the rabies virus to both animals and humans, and are a suspected vector in the spread of the deadly viral diseases SARS and ebola.
ANY infected animal can spread diseases. Any mammal can carry rabies; most varieties of insect carry various viruses.
Different types of parasites have their own ways of spreading their offspring. Many intestinal parasites spread their offspring to other animals by laying eggs in the fesces. After the fesces are eliminated, other animals can inhale the eggs from the fesces, and then the parasites will hatch out of the eggs inside the new host. They can also spread from a prey animal to a predator when the former is consumed. BTW: Although the term "parasite" usually refers to parasitic worms in an animal's digestive tract, the technical definition of "parasite" is any organism that gains from another organism, causing harm to the other organism in the meantime.
In some cases, zoonotic diseases are transferred by direct contact with infected animals, much as being near an infected human can cause the spread of an infectious disease. Other diseases are spread by drinking water that contains the eggs of parasites.
Mosquito
A bacterial infection that can be spread through lice is called bartonellosis or Trench fever. Animals, specifically cats, can spread an infection called toxoplasmosis. The common types of infection that animals and insects pass on to humans include dengue fever, malaria, and Lyme disease.
the insect will eat the plant so it will spread through the plant into the insect killing the insect.
The animal that started the plague first was the rat. They had parasites in their skin and spread it to humans