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About Rabies

Rabies is a deadly viral disease that targets the central nervous system. It spreads primarily through saliva from the bite of an infected mammal. Although the disease is nearly always fatal once clinical signs appear, immediate wound care and modern post-exposure prophylaxis (PEP) make it almost entirely preventable.

Author

Dr. Sarah Johnson, MD, Infectious Diseases

Medical Director, Rabies Prevention Hub

Dr. Johnson oversees medical content and ensures alignment with CDC and WHO guidance on rabies prevention and treatment.

Key Facts

  • WHO estimates ~59,000 human deaths globally each year, with most cases linked to dog bites in low-resource regions.
  • Rabies is almost always fatal once neurological symptoms begin, underscoring the urgency of early intervention.
  • Prompt wound care, rabies immune globulin, and vaccine series are nearly 100% effective when started before symptom onset.
  • In the United States, bats are now the leading source of human rabies exposures, while dogs remain the major source worldwide.
  • Vaccinating pets and maintaining ≥70% dog vaccination coverage are proven strategies to break transmission cycles.
  • Incubation typically ranges from 1–3 months but can be shorter or longer depending on bite location, severity, and viral load.

What It Is / Why It Matters

Rabies is caused by Lyssavirus, a neurotropic virus that infects mammals—including humans. The virus concentrates in nervous tissue and saliva and is usually transmitted through the bite of a rabid animal. Scratches or saliva touching mucous membranes or fresh wounds can also transmit infection (WHO).

Why it matters: Rabies is one of the oldest and most feared diseases known to humanity. Despite being preventable, it continues to claim tens of thousands of lives each year, primarily in Asia and Africa. Understanding rabies is crucial because:

Transmission

Rabies virus enters the body through broken skin or mucous membranes:

  • Bites: The vast majority of human cases follow a bite from a rabid animal. Learn emergency steps after a bite.
  • Scratches: Especially if saliva from a rabid animal contaminates the wound.
  • Mucous membranes: Exposure of eyes, nose, or mouth to infected saliva can transmit the virus.
  • Fresh skin breaks: Saliva entering open cuts or abrasions poses a risk.

Animals that can transmit rabies:

  • Dogs (nearly 99% of human rabies deaths worldwide are linked to dog bites).
  • Cats, ferrets, and other companion animals when unvaccinated.
  • Bats (the leading source of human rabies in the United States).
  • Raccoons, skunks, foxes, and other wildlife reservoirs depending on the region.

Important: Casual contact such as petting a rabid animal or contact with dried saliva does not transmit rabies. The virus must reach nerves through fresh breaks in the skin or mucosa (CDC).

Early Symptoms & Incubation

Incubation Period: The time between exposure and symptom onset is typically 1-3 months but can range from days to over a year. Factors affecting incubation include:

  • Location of the bite (closer to the brain = shorter incubation)
  • Severity of the wound
  • Amount of virus introduced
  • Age and immune status of the person

Early Symptoms (Prodromal Phase):

  • Fever
  • Headache
  • Malaise and fatigue
  • Pain, tingling, or itching at the bite site
  • Anxiety and agitation

Advanced Symptoms (Neurological Phase):

  • Hydrophobia (fear/painful spasms when swallowing water) and throat spasms.
  • Aerophobia (sensitivity to air drafts) and generalized muscle spasms.
  • Hallucinations
  • Excessive salivation
  • Paralysis
  • Coma and death

Once symptoms appear, rabies is almost always fatal. Learn more about recognizing rabies symptoms early. This is why prompt PEP is critical (CDC).

Prevention

Quick Prevention Wins:

  • Vaccinate pets: Keep dogs and cats up-to-date on rabies vaccinations
  • Avoid wildlife: Follow proven prevention strategies to reduce exposure risks
  • Supervise children: Teach kids to avoid unknown animals
  • Secure trash: Prevent attracting wildlife to your property
  • Report strays: Contact animal control for unvaccinated animals
  • Pre-exposure vaccination: Recommended for travelers to endemic regions and high-risk occupations (veterinarians, animal handlers, laboratorians)

Community Prevention: Achieving ≥70% dog vaccination coverage in at-risk areas is the threshold recommended by WHO to interrupt dog-mediated transmission.

When to Seek Care

Seek immediate medical care if:

  • You've been bitten or scratched by any animal (wild or domestic)
  • You've had contact with a bat (even if you don't see a bite)
  • An animal's saliva has contacted your eyes, nose, mouth, or an open wound
  • The animal cannot be observed or tested

What to do immediately:

  1. Wash the wound thoroughly with soap and water for 15 minutes
  2. Apply povidone-iodine if available
  3. Seek medical attention immediately
  4. Contact your local health department

Learn more about emergency response steps after a bite. PEP (Post-Exposure Prophylaxis): If indicated, post-exposure prophylaxis includes rabies immune globulin and a vaccine series. When administered promptly according to CDC protocol, PEP is nearly 100% effective at preventing disease (CDC).

Frequently Asked Questions

Can rabies be cured after symptoms appear?

Unfortunately, once symptoms appear, rabies is almost always fatal. There have been extremely rare cases of survival with intensive medical care (the Milwaukee Protocol), but these are exceptional. This is why prompt PEP before symptoms is critical.

How long does it take for rabies symptoms to appear?

The incubation period is typically 1-3 months but can range from days to over a year. The location of the bite, severity of the wound, and amount of virus introduced all affect the incubation period.

Can you get rabies from a scratch?

Yes, if the scratch is contaminated with infected saliva. Any break in the skin that comes into contact with infected saliva can transmit rabies. Treat scratches the same as bites.

Do all dog bites cause rabies?

No. Only bites from rabid animals transmit rabies. However, if you cannot confirm the animal's vaccination status or observe it for 10 days, PEP may be recommended as a precaution.

Is rabies only transmitted by dogs?

While dogs are the main source globally, rabies can be transmitted by any infected mammal. In the Americas, bats are the most common source. Other animals include cats, raccoons, skunks, foxes, and other wildlife.

Can rabies be transmitted from person to person?

No, rabies is not transmitted from person to person through casual contact. There have been extremely rare cases of transmission through organ transplantation from an infected donor.

What should I do if I find a bat in my house?

If you find a bat in your house, especially in a room where someone was sleeping, contact your local health department. Bats have small teeth and bites may not be visible. PEP may be recommended even without a visible bite.

How effective is the rabies vaccine?

The rabies vaccine is highly effective. Pre-exposure vaccination provides protection, and PEP (post-exposure prophylaxis) is nearly 100% effective when started promptly after exposure, before symptoms appear.

How is rabies diagnosed in humans?

Laboratory testing (saliva, serum, spinal fluid, or skin biopsy) is required to confirm infection. Because results can take time, clinicians typically start PEP immediately if exposure is suspected.

Which animals most often transmit rabies in the United States?

Bats are the leading source of human rabies in the U.S., followed by raccoons, skunks, and foxes. Globally, unvaccinated dogs remain the primary source of human exposure.

References

Medically reviewed by Dr. Huma Ashraf, MBBS, FCPS — January 16, 2025

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