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Vaccination and Symptoms of Rabies

Updated on September 19, 2012

Rabies virus

Carried by animals to other animals or humans, rabies is a virus that attacks the nervous system that can lead to death if not treated. This virus is called, Lyssavirus rabies; Latin: rabies, meaning, ‘madness.’ It enters the body through a puncture, i.e. bite, and is carried to the brain, (and other organs), through the nervous system. Once infected, the virus causes swelling in the brain, seizures and respiratory failure. The areas of the brain that is most affected is the hippocampus, limbic system, medulla and cerebellum.

The incubation period may take up to months, depending on where the bite occurred. However, once the central nervous system is affected with the virus, treatment is too late and death will occur in a matter of days. In some rare cases the saliva of an infected animal can enter the victim through an open wound. Tests are taken of the infected animal from the brain tissue to determine if the animal is infected. If the animal is unobtainable, treatment will be initiated as a safeguard.



Symptoms of rabies

Symptoms of rabies include: flu like symptoms in the first few days like headache, body aches and fever, nausea and loss of appetite.

Advanced stage includes behavioral changes such as: anxiety, confusion, agitation or delirium; unusual or bizarre behavior; labile mood; periods of mania; malaise; depression.

Late stages: difficulty swallowing, paralysis, violent movements and uncontrolled excitement; hydrophobia; inability to quench thirst, and respiratory insufficiency leading to coma and death.



Prevention of rabies

1. Home pets: dogs, cats, ferrets and farm animals, such as cattle, can be vaccinated.

2. Keep animals from wandering freely, especially in areas where wild animals roam.

3. Don’t handle wild animals or strays.

4. Report roaming animals in the neighborhood.


Rabies in Dogs

Click thumbnail to view full-size
Cats should be vaccinated to avoid getting rabiesDogs should have an annual rabies vaccinationWolves, and other wild animals, can be carriers of the rabies virus
Cats should be vaccinated to avoid getting rabies
Cats should be vaccinated to avoid getting rabies | Source
Dogs should have an annual rabies vaccination
Dogs should have an annual rabies vaccination | Source
Wolves, and other wild animals, can be carriers of the rabies virus
Wolves, and other wild animals, can be carriers of the rabies virus | Source

Rabies in dogs and other animals

Domesticated animals, such as dogs, cats and other pets, are usually not carriers of the rabies virus. However, dogs that run freely and are exposed to attacks by wild animals are subject to rabies. Animals within city limits are required by law to be vaccinated. This protects them and humans from the possibility of being infected.

In the United States, raccoons are the most common carriers of the rabies virus. Just recently, a local news station picked up a story of a man who had been chased by a raccoon in broad daylight. The raccoon jumped on the man’s back and would not let go. He finally rolled it off and sought help. The animal control officers managed to capture the raccoon and the gentleman started the series of treatments necessary to kill the virus.

Bats are the second greatest problem and many people are bitten during run ins with them while camping or surprising them in a dark enclosure. If you are bit or scratched by a bat, or suspect that you may have been, it is imperative to seek immediate medical treatment.



Rabies Vaccination

Louis Pasteur and Emile Roux developed the first rabies vaccine in 1885. This was a nerve tissue derived vaccine taken from infected rabbits. This method is still used in some countries because it is less expensive. In 1967 a human diploid cell rabies vaccine was developed, (HDCV). This drug goes by the name of Imovax Rabies. Later, a purified chicken embryo cell vaccine, (PCECV), became available. This drug goes by the name of RabAvert. Both of these are less costly.

Pre-exposure vaccination, for travelers and professional animal handlers, consist of three doses one week apart from each other. Post-exposure vaccination should get four doses: immediate, day 3, day 7, and day 14. A Rabies Immune Globulin, human, (HRIG), injection is also recommended to be given at the same time the first PEP injection is administered.



Contraindications of the rabies vaccine

Some medications do not mix well with the rabies vaccine. It is always important to give your doctor or health care provider a complete list of medications that you are taking. The following medications could have an adverse reaction and should be considered during the time of rabies treatment for optimal safety and results. These include: steroids, chemotherapy or radiation for cancer treatments, and inhalant or nasal steroids. Check with your pharmacist or physician for a complete list that may have contrary effects.


Side Effects of Rabies Vaccination

Some people may be allergic to the vaccination. This can cause serious problems such as respiratory difficulties, throat closure, dizziness or weakness, a rapid heart rate or hives. These symptoms should be treated immediately by calling a physician or transporting the person to a medical facility.

Common side effects include systemic reactions such as swelling, redness, itching in the area of the injection. Other mild side effects include general muscle soreness, head ache, dizziness and abdominal pain or nausea.

More severe problems such as fever, joint pain or hives have also been reported.

Infrequently, nervous system disorders, such as Guillain Barre Syndrome, (GBS), can occur.

Important: it is vital that the rabies vaccination is completed in its entirety in order to build up the necessary immunity.




Hydrophobia

Hydrophobia is a fear of water. When people are in an advanced stage of the rabies virus they can develop paralysis in areas of their body, such as their throat. This causes a difficulty in swallowing. The result is a fear that they will choke on water that is offered to them, despite the intense thirst. Between 50-80% of people develop this symptom. Treatment would include management of hydration through intravenous means.



Interesting facts about rabies

Animals that commonly carry the virus are: raccoons, bats, opossums, skunks, dogs, cats, wolves, foxes and monkeys.

In the last century human deaths have decreased from 100 per year to 2-3 per year.

Annually, 16,000-39,000 are exposed to potential rabies and receive post-exposure prophylaxis treatment, or PEP.

Rabies can be found anywhere in the world. Countries that have the biggest problems are: Asia, Africa, Central and South America.

It’s suggested that people be vaccinated prophylactically when traveling to these countries.

Over 55,000 people and millions of animals die from rabies throughout the world.

Infected dogs are the leading cause of the rabies deaths in Asia and Africa.

There were only 55 cases of rabies diagnosed since 1990 in the U.S.

World Rabies Day is held on September 28th of each year to raise awareness of this worldwide deadly disease. This is sponsored by W.H.O. and the Global Alliance for Rabies Control.



Countries with most rabies virus

A
Asia:
Asia

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B
Africa:
Africa

get directions

C
South America:
South America

get directions

D
Central America:
Central America

get directions

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