Saturday, December 27, 2008

Rats, mice, fleas and infectious diseases

According to Wikipedia, the Bubonic Plague, the disease that is believed to be what caused the Black Death in Europe in the 1340's, was caused by fleas seeking out human hosts after the bodies of infected rats, mice and other small vermin died.

The Bubonic Plague caused the deaths of nearly 200 million people. Bubonic Plague kills about 50% of infected patients in 4-7 days without treatment. Luckily we now have a myriad of treatments and patients with plague in the modern era usually recover completely with prompt diagnosis and treatment.
http://img83.imageshack.us/img83/59/ratfleas4569lwgm7.jpg
Click above for larger image: Electron micrograph view of rat flea, by Dr. Tony Brain/Science Photo Library

According to National Geographic:
A flea clings to rat fur in this colored scanning electron micrograph. As carriers of plague, fleas have claimed more victims than all the wars ever fought.
There are other diseases which rats, mice and their fleas spread even today

Here's a list of the diseases spread by mice and rats from the folks at AAA Animal control out in Florida, who compiled the info from the Center For Disease Control and Prevention:
  • Hantavirus Pulmonary Syndrome (HPS): Hantavirus pulmonary syndrome (HPS) is a deadly disease transmitted by infected rodents through urine, droppings, or saliva. Humans can contract the disease when they breathe in aerosolized virus. HPS was first recognized in 1993 and has since been identified throughout the United States. Although rare, HPS is potentially deadly. Rodent control in and around the home remains the primary strategy for preventing hantavirus infection.
  • Murine Typhus: Murine typhus (caused by infection with R. typhi) occurs worldwide and is transmitted to humans by rat fleas. Flea-infested rats can be found throughout the year in humid tropical environments, but in temperate regions are most common during the warm summer months. Travelers who visit in rat-infested buildings and homes, especially in harbor or riverine environments, can be at risk for exposure to the agent of murine typhus.
  • Rat-bite fever (RBF): Rat-bite fever (RBF) is a systemic bacterial illness caused by Streptobacillus moniliformis that can be acquired through the bite or scratch of a rodent or the ingestion of food or water contaminated with rat feces.
  • Salmonella enterica serovar Typhimurium: As its name suggests, it causes a typhoid-like disease in mice. In humans S. Typhimurium does not cause as severe disease as S. Typhi, and is not normally fatal. The disease is characterized by diarrhea, abdominal cramps, vomiting and nausea, and generally lasts up to 7 days. Unfortunately, in immunocompromized people, that is the elderly, young, or people with depressed immune systems, Salmonella infections are often fatal if they are not treated with antibiotics.
  • Leptospirosis: Leptospirosis is a bacterial disease that affects humans and animals. It is caused by bacteria of the genus Leptospira. In humans it causes a wide range of symptoms, and some infected persons may have no symptoms at all. Symptoms of leptospirosis include high fever, severe headache, chills, muscle aches, and vomiting, and may include jaundice (yellow skin and eyes), red eyes, abdominal pain, diarrhea, or a rash. If the disease is not treated, the patient could develop kidney damage, meningitis (inflammation of the membrane around the brain and spinal cord), liver failure, and respiratory distress. In rare cases death occurs.
  • Eosinophilic Meningitis: Eosinophilic meningitis is an infection of the brain occurring in association with an increase in the number of eosinophils, white blood cells that are associated with infection with worms that penetrate into the body. The organism most commonly causing eosinophilic meningitis is a rat lung worm called angiostrongylus cantonensis.
So there you have it, not only do the rats provide a major problem, but their parasites(the fleas, the worms) can be even more harmful

It's time to call Billy and Barbara and end your rat infestation for good, for you, your customers and your family. Get em now, cause your life could be at stake.

Sick of rats

http://www.vatanappally.com/images/yp_rats.jpg

Hate seeing your kid in the middle of the rats lifestyle?

It's time to call B&N Exterminating.

Of course the picture above is from a place where the rats are accepted, heres the caption from Vantappally.com:
An child places his arms in a tray full of milk as rats drink at the Karni Mata Hindu temple in the town of Deshnoke in India's northwestern state of Rajasthan. Rats, hundreds and hundreds of them, are everywhere at the temple in the state and woe betide anyone who takes fright and steps on one. Picture taken June 20, 2002. REUTERS/Kamal Kishore/

The rats are very integrated into the lives of the Indian village, but rats here in New York are a bit different, many wouldn't think twice about biting if they felt cornered, and many of us wouldn't be at all happy about having our kids anywhere near a non-domesticated rat. In fact the destruction a rat family can do in your household is very dangerous, like many other vermin, the need to cut the size of the teeth causes the animal to gnaw at anything it comes across, Squirrels, mice and rats are notorious at biting through electrical lines, building insulation and anything else that comes across their paths.

They carry diseases!

The rats in India probably carry their fair share of disease, but I would think that the integration between them and humans has caused a certain level of immunity of the people there.