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9 Diseases Caused by House Rats: Types, Symptoms, Diagnosis & Treatment

diseases caused by rat — (Source: jcehrlich)

House rats are the carrier of several diseases that result in severe sickness and, in a worse case, death. Among the diseases transmitted by direct contact are rat bites, while disposing of infected dead rats, inhaling dust and consuming foods and drinks contaminated with infected rats’ urine, hair, saliva and faeces. Diseases caused by rats can also be transmitted indirectly by parasites like fleas, ticks and mites that live on the infected rodents.

What Are the 9 Diseases Caused by Rats and Their Symptoms?

Rats have a common association with both nature and humans. An instance is the 14th-century bubonic plague, better known as ‘black fever. Since then, this rodent family has been a potential carrier of fatal diseases.

Here is the list of 9 diseases caused by rats to humans.

1. Hantavirus

Symptoms

Nearly 38% of Hantavirus infections lead to death. Commonly the signs of Hantavirus appear within 1 to 5 weeks (incubation period). Fatigue, fever, muscle pain, diarrhoea, nausea and abdominal pain are some of the early symptoms of this disease caused by rats. The signs of HPS that spread throughout the body are

Lung congestion
Fluid accumulation in the lungs
Breathlessness

Diagnosis

As the early Hantavirus symptoms are similar to influenza, it is difficult to diagnose the infection. Regardless, if individuals with frequent rodent exposure experience fever, breathlessness and fatigue, they must seek medical assistance at the earliest opportunity.

Treatment

Unfortunately, there is no definitive vaccine, drugs or treatment for Hantavirus. However, identifying the early symptoms and immediate medical aid in the intensive care unit may improve the survival chances from severe HPS.

2. Haemorrhagic Fever with Renal Syndrome

Rats, along with other rodents like mice, voles etc., transmit this acute zoonotic disease through their aerosolized excrements. Various Hantavirus species use rodents as the carrier of Haemorrhagic Fever with Renal Syndrome (HFRS).

Symptoms

HFRS has acute flu-like signs, including headache, high fever and vomiting. However, depending on the severity, patients can have symptoms like

Hypotensive Shock-Like SOB,
Diaphoresis,
Palpitations
Confusion

Diagnosis

The diagnosis in patients with a clinical history similar to HRFS requires various laboratory examinations. A positive serologic test report confirms the disease. Further, doctors recommend immunohistochemical staining and microscope examination and proof of Hantavirus RNA sequences in blood or tissue to recognise this infection.

Treatment

Supportive care, including optimal hydration with electrolytes such as sodium, potassium and chloride and maintenance of oxygen level and blood pressure, are the mainstay treatment for the disease. At times, dialysis is required to restore severe fluid overloading. Furthermore, an early dose of an antiviral drug named intravenous ribavirin has shown positive results to control the infection.

3. Lassa Fever

This is also an acute zoonotic viral disease transmitted by multimammate rats (Mastomys natalensis). These rats shed the Lassa virus in urine and faces and contaminate food and other objects.

Symptoms

Mild fever, common malaise, headache and weakness are some of the early symptoms of Lassa fever. However, infected individuals may also exhibit severe signs like-

Haemorrhaging in eyes, gums or nose
Respiratory complications
Vomiting tendency
Swollen face
Chest, back and abdominal pain and shock

A few neurological symptoms of Lassa fever include hearing disability, tremors and encephalitis, and in a worse condition, multi-organ failure and eventually death within 2 weeks.

Diagnosis

Lassa fever is commonly diagnosed with enzyme-linked immunosorbent serologic assays (ELISA). Besides, the reverse transcription-polymerase chain reaction (RT-PCR) test detects the disease early.

Treatment

Ribavirin antiviral drug has shown effective results in curing the infection if taken at an early stage. Patients should also be kept under supportive care to maintain accurate fluid and electrolyte, oxygenation and blood pressure to avoid complications.

4. Leptospirosis

This is a bacterial infection caused by Leptospira interrogans bacterium. Rodents like rats, mice etc., are the vectors of this bacteria that live in their kidneys and contaminate soil and water through urine.

Symptoms

Apart from fever spiking to 104°F, other common signs of this bacterial infection are-

Muscle pain
Headache
Vomiting
Diarrhoea
Jaundice
Skin rash

Diagnosis

The most effective way to diagnose this bacterial infection is through serological tests such as-

Microscopic Agglutination Test (MAT) for detecting serovar-specific antibodies
Solid-phase assay to identify Immunoglobulin M (IgM) antibodies

Treatment

Doses of antibiotics like penicillin or doxycycline are recommended at an early stage of Leptospirosis. Nonetheless, patients with severe symptoms require intravenous antibiotics for quick recovery.

5. Lymphocytic Chorio-Meningitis

This neurological disease caused by rats and mice are -

Aseptic meningitis- inflammation of meninges, a membrane that surrounds the brain and spinal cord)
Encephalitis- Inflammation of the brain
Meningoencephalitis- inflammation of both the brain and meninges

Lymphocytic choriomeningitis virus, found in the saliva, urine, and faeces of infected mice and rats, causes Lymphocytic Chorio-Meningitis (LCM).

Symptoms

The onset of these viral infection signs occurs within 8 to 10 days after coming in contact with the virus. The early symptoms include-

Fatigue
Muscle pain
Fever
Loss of appetite
Nausea
Headache
Vomiting

After recovering these symptoms, an infected individual can have signs, including-

Meningitis (neck stiffness, headache and fever)
Encephalitis (drowsiness, sensory disorders like paralysis, confusion)

Diagnosis

Acute conditions in humans can be detected by isolating the virus from cerebrospinal fluid. Additionally, the immunofluorescent antibody test and ELISA are 2 other effective ways to diagnose LCM disease.

Treatment

Anyone with LCM symptoms should be admitted to a hospital under supportive care, depending on the seriousness. Moreover, ribavirin is effective against such viral diseases.

6. Plague

Though the Yersinia pestis bacteria are responsible for the plague, rats are the amplifying factor of the disease. It is transmitted to rats through fleas present on their bodies and infects humans through a bite, inhalation of respiratory droplets of another infected person and contact with contaminated materials. Primarily, there are 2 types of clinical forms of plague- bubonic and pneumonic.

Symptoms

Patients infected with plague bacteria develop acute febrile disease after 1 to 7 days of incubation. A few common symptoms are-

Headache
Body aches
Fever
Tremor
Nausea
Vomiting

Diagnosis

One of the effective ways to detect the plague is identifying Y. pestis bacteria from a blood or sputum sample. Another potential diagnosis is a laboratory approved rapid dipstick test.

Treatment

Antibiotics like enterobacteria (gram-negative rods) and supportive therapy are essential for patients with the pneumonic plague at the early stage.

7. Rat-Bite Fever

Rat-bite fever or RBF is a severe disease caused by Streptobacillus moniliformis or Spirillum minus bacteria found in rats’ urine, saliva, and faeces. Besides, rat bites and scratches are the other possible causes.

Symptoms

RBF signs and symptoms depend on the type of bacterial infection. The symptoms of streptobacillary RBF are-

Rash near the rat bite
Joint and muscle pain in the lower abdomen
Nausea
Sudden fever (on and off for several weeks)
Sore throat
Vomiting

However, the spirillary RBF develops similar symptoms other than hard or soft lymph nodes and inflammation near the bite.

Diagnosis

Medical practitioners detect the clinical variants of rat-bite fever in 2 ways.

For streptobacillary RBF, doctors look for joint pain and culture blood or joint fluid.
For spirillary RBF, doctors assess, look for swollen lymph nodes and determine blood or infected tissue samples.

Treatment

Both the RBF variants are treated with amoxicillin, penicillin, erythromycin, or doxycycline.

8. Salmonellosis

This is one of the diseases spread by rats in India. They contaminate foods and drinks with Salmonella bacteria through urine and faeces, causing Salmonellosis, food poisoning and other stomach-related illnesses.

Symptoms

A few common signs of Salmonella infection are-

Cramps in stomach
Blood in stool
Cold
Fever
Diarrhoea
Headache
Vomiting
Stomach upset

Diagnosis

Experts culture blood or stool samples to diagnose Salmonellosis.

Treatment

Patients should drink sufficient water and other fluids to steer clear of dehydration. Doctors may also suggest antibiotics, rehydration liquid or medicines like Loperamide for those suffering from diarrhoea, based on the severity of the disease.

9. Tularemia

This is one of the fatal diseases caused due to rats affecting the eyes, skin, lungs and lymph nodes. The rodents are the vector of Francisella tularensis and transmit the bacterium through bites and direct exposure.

Symptoms

Based on the site of infection, Tularemia has 6 clinical variants with a distinctive set of signs and symptoms. They are-

Ulceroglandular Tularaemia (most common)
- Skin ulcer (usually forms at the site of the infection)
- Swollen lymph glands
- Headache
- Fever
- Shivering
- Exhaustion
Glandular Tularaemia (same as Ulceroglandular, except for skin ulcers)
Oculoglandular Tularaemia (affects eyes)
- Eye redness
- Eye Pain
- Swelling and discharge from eyes
- Ulcer inside eyelid
- Light sensitivity
Oropharyngeal Tularemia (affects mouth, throat and digestive tract)
- Throat pain
- Fever
- Ulcer inside mouth
- Abdominal pain
- Diarrhoea
- Vomiting
- Inflamed tonsils
- Swollen lymph nodes (neck)
Pneumonic Tularemia
- Dry cough
- Chest pain
- Breathlessness
Typhoidal Tularaemia (rare and fatal)
- High fever
- Muscle aches
- Sore throat
- Enlarged spleen
- Vomiting
- Diarrhoea
- Enlarged liver
- Pneumonia

Diagnosis

Tularemia is a rare disease with symptoms similar to other diseases caused by rats. The best way to identify the infection is through blood tests. One can also opt for a chest X-ray for pneumonia detection.

Treatment

One of the effective treatments of Tularaemia is gentamicin (antibiotic) injection shot directly into muscle or vein. Streptomycin is also a reliable cure for the disease. In addition, doctors prescribe oral antibiotics like doxycycline or ciprofloxacin for fast results.

What Are the Preventive Measures to Control Diseases Caused by Rats?

There are 3 simple preventive measures to control the diseases caused by rats, including-

Sealing all entry holes, including cracks, crevices and holes to prevent rats and mice from entering.
Trapping is a permanent solution to keep diseases caused by rats at bay.
Cleaning and disinfection of the rodent-infested area are essential to keep the diseases caused by rats at bay. Individuals must be cautious while cleaning such areas and wear masks and gloves to avoid contamination.

Frequently Asked Questions

✓ What are the risk factors of Tularemia?

The risk factors associated with Tularemia are-

Exposure to wild animal blood and consumption of wild animal flesh
By inhaling Tularemia-causing bacteria while working with soil, using lawn mowers and weed trimmers
People working with wild and domestic animals

✓ What are the diseases that are caused indirectly by rats and other rodents?

Few diseases caused indirectly by rodents include-

Babesiosis
Colorado Tick Fever
Cutaneous Leishmania Infection
Murine Typhus
Omsk Hemorrhagic Fever etc.

✓ How do rodents transmit Hantavirus?

The primary modes of Hantavirus transmission are via rodents’-

Urine
Faeces
Saliva

Apart from these, an individual can come in contact with the virus in the following ways-

Inhalation of Hantavirus from rodent droppings and nesting materials
Consumption of food and drinks contaminated by rodents
Bites and scratches of an infected rat or mouse
Touching eyes, mouth or nose with hand after touching contaminated objects

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Arogya Sanjeevani

Disclaimer #1: *Customer can choose options at the time of availing insurance. Premium amount may vary accordingly. Insured is required to disclose any pre-existing condition or on going treatment before policy issuance in the proposal form.

Disclaimer #2: This information is added only for informative purposes and collected from different sources across the Internet. Digit Insurance is not promoting or recommending anything here. Please verify the information before making any decisions.

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Go Digit General Insurance Limited (formerly known as Oben General Insurance Ltd.) - Registered Office Address - 1 to 6 floors, Ananta One (AR One), Pride Hotel Lane, Narveer Tanaji Wadi, City Survey No.1579, Shivaji Nagar, Pune-411005, Maharashtra | Corporate Office Address - Atlantis, 95, 4th B Cross Road, Koramangala Industrial Layout, 5th Block, Bengaluru-560095, Karnataka