What Does Rabies Do to Humans?

Rabies is a viral disease that affects the central nervous system. It spreads primarily through the saliva of infected animals, usually via bites or scratches. Left untreated, rabies causes severe neurological damage and is almost always fatal once symptoms appear. Understanding how rabies impacts the human body can help you recognize early warning signs and seek prompt medical care.

How Rabies Enters the Body

• Bite or scratch from an infected animal: The virus lives in saliva and enters your tissue.
• Mucous membrane exposure: Contact with eyes, nose, or mouth.
• Rare routes: Organ transplantation or inhalation in research labs.

Once inside, the rabies virus travels along peripheral nerves toward the spinal cord and brain.

Incubation Period

• Typical range: 1–3 months.
• Variations: As short as a week or longer than a year.
• Factors affecting timing:
  • Distance of the wound from the brain.
  • Severity of the bite.
  • Amount of virus introduced.

During incubation, you usually feel fine and show no symptoms, making prompt action after any suspicious animal contact crucial.

Impact on the Nervous System

Rabies is neurotropic—it attacks nerve cells:

1. Peripheral nerve infection
   The virus binds to nerve endings at the wound site.

2. Centripetal spread
   It moves toward the spinal cord, often at a rate of a few millimeters per day.

3. Central nervous system invasion
   Once in the brain, it multiplies rapidly, causing widespread inflammation (encephalitis).

4. Centrifugal spread
   The virus travels back out along nerves to salivary glands, eyes, skin, heart, and other organs.

This progression explains why rabies symptoms first appear near the wound and then become more generalized.

Common Symptoms in Humans

Rabies signs unfold in two main phases—prodromal (early) and neurological (advanced).

Early (Prodromal) Phase

Lasts 2–10 days. Symptoms may include:

• Fever and headache
• General weakness or discomfort
• Pain, tingling, or itching at the bite site
• Loss of appetite
• Nausea or vomiting

These vague signs can mimic flu or other infections.

Neurological (Advanced) Phase

Appears 2–7 days after prodromal signs. Two clinical forms:

1. Furious rabies (classic form)

   • Agitation, restlessness, anxiety
   • Hydrophobia (fear of water) due to painful throat spasms
   • Aerophobia (fear of drafts or air movement)
   • Excessive salivation and foaming at the mouth
   • Hallucinations or delirium

2. Paralytic rabies (dumb form)

   • Muscle weakness starting at bite site
   • Gradual paralysis progressing to coma
   • Less dramatic but equally deadly

Both forms ultimately lead to respiratory failure and death if untreated.

Why Rabies Is Nearly Always Fatal Once Symptoms Appear

• Rapid brain damage: The virus causes massive inflammation and neuronal death.
• No effective cure: Once clinical signs develop, supportive care is the only option.
• High mortality: Fewer than 1% of symptomatic cases survive.

Early intervention—before symptoms—remains the only reliable way to prevent the deadly outcome.

Treatment Options

Post-Exposure Prophylaxis (PEP)

PEP is nearly 100% effective if started promptly:

1. Immediate wound care

   • Wash wound thoroughly with soap and water for 15 minutes.
   • Apply antiseptic (e.g., povidone‐iodine).

2. Rabies immunoglobulin (RIG)

   • Given around the wound site and intramuscularly.
   • Provides immediate antibodies.

3. Rabies vaccine series

   • Four doses over 14 days (Days 0, 3, 7, 14).
   • Stimulates your immune system to make its own antibodies.

Pre-Exposure Prophylaxis (PrEP)

Recommended for high-risk groups (veterinarians, lab workers, travelers):

• Three-dose vaccine series (Days 0, 7, 21 or 28).
• Simplifies PEP if later exposed (no RIG needed).

Prevention Strategies

• Vaccinate pets and livestock
• Avoid contact with wild animals
• Report stray or sick animals to authorities
• Use protective gloves if handling wildlife
• Teach children to steer clear of unfamiliar animals

What Should You Do If You Suspect Rabies?

• Seek medical care immediately. Time is critical.
• Clean the wound thoroughly at home while getting to a clinic.
• Begin PEP as soon as possible—don’t wait for symptoms.
• For guidance on symptoms and next steps, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker.

Final Advice

Rabies is a terrifying disease, but you can prevent it with prompt action. If you have any possible exposure or develop concerning symptoms, speak to a doctor right away. Always treat animal bites and scratches seriously—timely wound care and PEP save lives. Speak to a doctor about anything that could be life threatening or serious.