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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]
Viral infections can cause disease in humans, animals and plants. In healthy humans and animals, infections are usually eliminated by the immune system, which can provide lifetime immunity to the host for that virus. Antibiotics, which work against bacteria, have no impact, but antiviral drugs can treat life-threatening infections. Those ...
Other viruses, such as rabies virus, can infect different species of mammals and are said to have a broad range. [13]: 631 The viruses that infect plants are harmless to animals, and most viruses that infect other animals are harmless to humans.
"Viruses can jump between different species via the same modes of transmission that apply to humans, including direct contact with infected fluids, or getting bitten by other species, amongst ...
Not all viruses are harmful, and many don’t infect humans. But ones that do cause can cause COVID, flu, hepatitis, shingles, herpes, measles, colds and many other illnesses.
The transmission of viruses from animals to humans can occur, but such zoonotic infections are rare and subsequent human-to-human transmission of animal viruses is even rarer, although there are notable exceptions such as influenza. Most viruses are species-specific and would have posed no threat to humans. [14]
The diversity of human viruses is vast and continually expanding. As of now, there are 219 known species of viruses that can infect humans. This number continues to grow with three to four new species being discovered every year. The human virome is not stable and may change over time. In fact, new viruses are discovered constantly.
UK researchers have homed in on a human gene implicated in thwarting most bird flu viruses from infecting people. Bird flu chiefly spreads among wild birds such as ducks and gulls and can also ...