Infectious diseases specialists diagnose and treat infections from bacteria, viruses, fungi, and parasites, focusing on fevers, antibiotics, and vaccines.
Send us all your questions or requests, and our expert team will assist you.
Rabies is a serious and complex viral infection. At Liv Hospital’s Department of Infectious Diseases and Clinical Microbiology, it is defined as an acute, progressive viral encephalomyelitis. Rabies is a zoonotic disease, meaning it spreads from animals to humans, and is caused by neurotropic viruses in the Lyssavirus genus of the Rhabdoviridae family. The virus has a bullet-like shape and contains a single-stranded, negative-sense RNA genome. This structure helps the virus stay stable in different environments, protected by a nucleocapsid, but it is still sensitive to drying out and ultraviolet light.
Rabies is more than just a viral infection; it is a neurological emergency that attacks the central nervous system. Unlike viruses that travel through the bloodstream, rabies is strictly neurotropic. After entering the body, usually through a bite or scratch, the virus may first multiply in muscle cells. Its main goal is to reach the nerves. The virus attaches to nicotinic acetylcholine receptors at the neuromuscular junction to enter the peripheral nervous system. Once inside a nerve cell, it uses the host’s transport system, specifically dynein motor complexes, to move backward along the nerve toward the spinal cord and brain.
The way rabies spreads in the body is central to how the disease works. During the incubation period, the virus hides in the nervous system, avoiding detection by the immune system. This helps explain why rabies is so deadly. Once the virus reaches the brain, it spreads quickly, causing severe brain inflammation and nerve problems. It then moves outward from the brain to areas like the salivary glands, making it easier to pass the virus to another host. This life cycle shows how rabies has evolved to change host behavior and ensure its own survival.
Classical rabies is caused by the Rabies virus (RABV), but the term also includes other related viruses in the Lyssavirus genus. As scientists study these viruses more closely, the list of known species keeps growing. There are now almost 20 recognized species, and all of them can potentially cause deadly brain infections in humans.
Distinguishing between these virus types is important for tracking outbreaks and developing treatments, but the disease usually looks the same no matter which virus causes it. The standard rabies vaccine protects against RABV and some related lyssaviruses, but the variety within the genus makes it hard to create a single prevention strategy for all types.
Rabies is a neglected tropical disease that disproportionately affects marginalized populations in resource-limited settings. From an epidemiological standpoint, it is present on all continents except Antarctica, with the vast majority of human deaths occurring in Asia and Africa. The disease burden is primarily driven by domestic dog-mediated rabies, which accounts for nearly all human cases worldwide. However, in developed nations where dog rabies has been eliminated through mass vaccination programs, the epidemiological definition of risk has shifted towards sylvatic (wildlife) transmission cycles. In these regions, bats, raccoons, and foxes serve as the primary reservoirs.
Liv Hospital uses a “One Health” approach to rabies, understanding that human, animal, and environmental health are closely linked. Because the virus survives in wild animals, getting rid of rabies is difficult. The worldwide goal of “Zero by 30″—ending human deaths from dog-related rabies by 2030—needs teamwork between doctors, veterinarians, and environmental experts. This approach means treating every mammal bite as a possible rabies risk until it is ruled out.
Rabies affects the central nervous system in a unique way, causing little physical damage until the final stages. Unlike other brain infections that destroy cells and cause inflammation, rabies mainly disrupts how nerve cells work. It changes the release and uptake of chemicals like serotonin, GABA, and acetylcholine. These changes explain the severe behavioral symptoms in the “furious” form of rabies, such as aggression, hallucinations, and the classic fear of water (hydrophobia).
The rabies virus mainly attacks the limbic system, which controls emotions and behavior. By making the host more aggressive, the virus increases the chance of biting and spreading to others. This behavior change is a key feature of rabies. In the “paralytic” or “dumb” form, the disease causes weakness and paralysis that moves upward through the body, similar to Guillain-Barré syndrome. It is not fully known why some people get the furious form and others the paralytic form, but it may depend on the virus type, amount of virus, and the person’s immune response.
A key part of rabies is how the virus interacts with the blood-brain barrier (BBB). In most viral infections, the BBB becomes leaky, letting immune cells into the brain to fight the virus. Rabies, however, keeps the BBB intact early on, so immune cells cannot reach the virus. This lets the virus multiply in the brain with little interference. Only in the late stages does the immune system respond, but by then, the virus is usually too widespread to control. This ability to avoid the immune system makes rabies so deadly and hard to treat once symptoms appear.
Send us all your questions or requests, and our expert team will assist you.
A neurotropic virus has a specific affinity for nerve tissue. Unlike other viruses that might infect the lungs, liver, or blood, the rabies virus targets the nervous system specifically and travels through it. It enters nerve endings at the site of a bite and travels along the nerve fibers directly to the brain, bypassing the bloodstream for the majority of its incubation period.
While rabies is an ancient disease, it is considered re-emerging in specific contexts due to changes in human-animal interactions and wildlife movement. Urbanization can bring humans closer to wildlife reservoirs, such as foxes and bats. Additionally, the importation of animals from endemic regions can reintroduce the virus to areas where it was previously eliminated, requiring constant vigilance from public health authorities.
The rabies virus belongs to the Rhabdoviridae family, named for the Greek word “rhabdos,” meaning rod. The virus has a distinct bullet-like shape. This structural configuration, including the specific arrangement of glycoproteins on its outer envelope, is crucial to its ability to bind nerve receptors and to penetrate host cells. This unique morphology is a key feature identified in electron microscopy.
The “One Health” approach is a collaborative strategy that recognizes that human health is connected to the health of animals and the environment. In the context of rabies, this means that medical doctors, veterinarians, and ecologists must work together. Controlling rabies in humans is impossible without controlling it in animal reservoirs through vaccination and population management.
No, the rabies virus is relatively fragile outside of a host. It is an enveloped virus, meaning it has a lipid membrane surrounding it. This membrane is easily destroyed by sunlight, heat, drying out (desiccation), and common detergents or soaps. This fragility is why the virus does not persist in the environment as some bacteria do, but instead requires direct transmission through fluids like saliva.
Your Comparison List (you must select at least 2 packages)
