Rabies is a deadly viral disease that can be fatal in humans
Rabies is a deadly viral disease that is fatal in humans unless the victim receives prompt medical attention. Fortunately this disease has become fairly rare in the U.S. (23 cases from 2008 to 2017). The reasons for this decline are the widespread publicity this disease has received and the effective measures taken to prevent it.
The rabies virus is transmitted from the saliva of infected animals. This happens most often from a bite, although it can also occur from a scratch. Very rarely it is transmitted from saliva contact with broken skin or mucous membranes or from inhalation of aerosolized bat feces. About 40,000 people receive post-exposure treatment each year after contact with known or possibly rabid animals.
Although the rabies virus can infect just about any mammal, it is most frequently found in raccoons, skunks, bats, foxes and coyotes, and occasionally in cattle and unvaccinated cats and dogs. In 2015, 67 rabid dogs were reported in the U.S. including the District of Columbia and Puerto Rico; 244 rabid cats were reported. Wild animals account for 90 percent of reported cases in 2015 however. Bats were the most frequently reported rabid wildlife species (30.9% of all animal cases during 2015), followed by raccoons (29.4%), bats (10.4%), skunks (24.8 percent), and foxes (5.9 percent).
We tend to think of skunks, raccoons, foxes, coyotes, dogs and cats as being the major source of human rabies in the U.S. However, most cases have been caused by insectivorous bats. The most recent case was in Wyoming, in September 2017. In over half the cases, the victim wasn't even aware of having had contact with a bat. In less than half the cases, the victim recalled seeing a bat, but wasn't aware of being bitten or scratched. (Insectivorous bats have small, needle-like teeth and claws. Consequently, bites and scratches easily go undetected.)
Since 2011, seven human cases of rabies were contracted during foreign travel to the following locations: India, the Phillipines, the Caribbean, Guatemala, Brazil, Afghanistan and Haiti.
The bat implicated in most of these human cases is the widely distributed silver-haired bat (Lasionycteris noctivagans). Bats most frequently found infected with rabies virus include the big brown bat (Eptesicus fuscus) in the northeast, Mexican free-tailed bat (Tadarida brasiliensis) in the southwest and the red bat (Lasiurus borealis) in the southeastern and mid-Atlantic states.
How can rabies be prevented?
- Vaccinate pet dogs, cats and ferrets.
- Prevent or minimize contact between pets and wild animals.
- Pre-exposure vaccination if your work involves handling wild animals.
If you are bitten or scratched:
Immediately cleanse the wound thoroughly to flush out the virus.
Capture the animal if you can do so safely to have it tested for rabies by your local health department. Try not to damage the head since the brain has to be tested for the presence of the rabies virus. Never handle the animal with your bare hands. Wear thick leather gloves or use tongs or some other device to pick it up. Place the animal in a cardboard box, coffee can or some other suitable container.
If you can't safely capture the animal contact your animal control office for assistance. Write down your observations about the animal, including species, location, how contact with the animal occurred and any unusual behavior exhibited by the animal.
See a doctor immediately for follow-up and possible post-exposure treatment.
Call your local animal control office to pick up dead, sick, and acting animals that are acting strangely. Remember most wild animals normally will not approach humans and most are not active during the day.
Teach children not to handle stray animals even if they appear friendly.
Prevent bats from entering buildings where they might come into contact people and pets. Bats can enter openings as small as 1/4 by 1/2 inch.
1. Health Information, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Department of Health and Human Services.
2. Hunt, H.A. and Bhatnagar, K.P., "Human rabies and silver-haired bats in the United States", Bat research News, 38:4, pps. 85-88.
If you have any questions, please contact a Regional Public Health Consultant, park sanitarian or call your local Public Health office. You can find it here: https://www.naccho.org/membership/lhd-directory
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