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Different viruses can infect all the organs and tissues of the body and the outcomes range from mild or no symptoms, to life-threatening diseases. [5] Humans cannot be infected by plant or insect viruses, but they are susceptible to infections with viruses from other vertebrates. These are called viral zoonoses or zoonotic infections. [6]
Parvoviruses are among the smallest viruses (hence the name, from Latin parvus meaning small) and are 18–28 nm in diameter. [16] Parvoviruses can cause disease in some animals, including starfish and humans. Because the viruses require actively dividing cells to replicate, the type of tissue infected varies with the age of the animal.
[6]: 49 Different types of viruses can infect only a limited range of hosts and many are species-specific. Some, such as smallpox virus for example, can infect only one species—in this case humans, [13]: 643 and are said to have a narrow host range. Other viruses, such as rabies virus, can infect different species of mammals and are said to ...
Of those, about 320,000 types of viruses infect mammals but there are just 219 known to infect humans, according to the U.S. National Library of Medicine. 52 Things You Need to Know About Viruses ...
animal virus Any virus capable of infecting one or more animal species. antigenic drift A gradual change in the antigenicity of a virus arising from the accumulation of mutations in the genes that code for surface proteins, which may result in new strains of the virus that are not as effectively inhibited by the same host antibodies that prevented infection by the original strain.
Animal viruses (3 C, 22 P) A. Arthropod-borne viral fevers and viral haemorrhagic fevers (5 C, 31 P) Avian influenza (1 C, 14 P) C. Viral infections of the central ...
Cross-species transmission is the most significant cause of disease emergence in humans and other species. [citation needed] Wildlife zoonotic diseases of microbial origin are also the most common group of human emerging diseases, and CST between wildlife and livestock has appreciable economic impacts in agriculture by reducing livestock productivity and imposing export restrictions. [2]
The females usually have only one baby per year, although they sometimes give birth to twins. Newborns stick close to their moms for the first few months and are fully weaned around six months old.